Why does the floating window lose focus ?

I am using DWM-6.0 on my FreeBSD 9.0 box. Somtimes when i am inputting something in a floating window, it will lose focus automatically. Then i have to press MODKEY+XK_j/XK_k to switch back. The following is my config.h
Code:
static const char font[]            = "-wenquanyi-wenquanyi bitmap song-medium-r-normal--12-130-75-75-p-80-iso10646-1";

static const char normbordercolor[] = "#444444";
static const char normbgcolor[]     = "#222222";
static const char normfgcolor[]     = "#bbbbbb";
static const char selbordercolor[]  = "#005577";
static const char selbgcolor[]      = "#005577";
static const char selfgcolor[]      = "#eeeeee";
static const unsigned int borderpx  = 1;        /* border pixel of windows */
static const unsigned int snap      = 32;       /* snap pixel */
static const Bool showbar           = False;     /* False means no bar */
static const Bool topbar            = True;     /* False means bottom bar */
/* tagging */
static const char *tags[] = { "1", "2", "3" };

static const Rule rules[] = {
        /* class      instance    title       tags mask     isfloating   monitor */
        { "Opera",     NULL,      NULL,       0,            True,        -1 },
        { "Wine",     NULL,       NULL,       1 << 1,       False,       -1 },
};

/* layout(s) */
static const float mfact      = 0.45; /* factor of master area size [0.05..0.95] */
static const int nmaster      = 1;    /* number of clients in master area */
static const Bool resizehints = True; /* True means respect size hints in tiled resizals */

#include "bstack.c"
#include "bstackhoriz.c"

/* first entry is default */
static const Layout layouts[] = {
        /* symbol     arrange function */
        { "><>",      NULL },    /* no layout function means floating behavior */
        { "TTT",      bstack },
        { "===",      bstackhoriz },
        { "[]=",      tile },
    { "[M]",      monocle },
};

/* key definitions */
#define MODKEY Mod4Mask
#define TAGKEYS(KEY,TAG) \
        { MODKEY,                       KEY,      view,           {.ui = 1 << TAG} }, \
        { MODKEY|ControlMask,           KEY,      toggleview,     {.ui = 1 << TAG} }, \
        { MODKEY|ShiftMask,             KEY,      tag,            {.ui = 1 << TAG} }, \
        { MODKEY|ControlMask|ShiftMask, KEY,      toggletag,      {.ui = 1 << TAG} },

/* helper for spawning shell commands in the pre dwm-5.0 fashion */
#define SHCMD(cmd) { .v = (const char*[]){ "/bin/sh", "-c", cmd, NULL } }

/* commands */
static const char *dmenucmd[] = { "/home/sw2wolf/bin/dmenu.sh", NULL };
static const char *browsecmd[]  = { "opera", NULL };
static const char *haltcmd[]  = { "sudo", "/sbin/shutdown", "-p", "now", NULL };
static const char *rebootcmd[]  = { "sudo", "/sbin/shutdown", "-r", "now", NULL };

static Key keys[] = {
        /* modifier                     key        function        argument */
        { MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
        { MODKEY,                       XK_w,      spawn,          {.v = browsecmd } },
        { MODKEY,                       XK_F11,    spawn,          {.v = rebootcmd } },
//      { MODKEY,                       XK_F12,    spawn,          {.v = haltcmd } },
        { MODKEY,                       XK_F12,    spawn,          SHCMD("sudo /sbin/shutdown -p now") },
        { MODKEY,                       XK_Print,  spawn,          SHCMD("scrot %Y%m%d-%H.%M.%S.png -t 280x175 -e 'mv $f $m ~'") },
        { MODKEY|ShiftMask,             XK_Print,  spawn,          SHCMD("scrot %Y%m%d-%H.%M.%S.png -t 280x175 -d 5 -e 'mv $f $m ~'") },
        { MODKEY,                       XK_b,      togglebar,      {0} },
        { MODKEY,                       XK_Tab,    focusstack,     {.i = +1 } },
        { MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
        { MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
        { MODKEY,                       XK_i,      incnmaster,     {.i = +1 } },
        { MODKEY,                       XK_d,      incnmaster,     {.i = -1 } },
        { MODKEY,                       XK_h,      setmfact,       {.f = -0.05} },
        { MODKEY,                       XK_l,      setmfact,       {.f = +0.05} },
//      { MODKEY,                       XK_Return, zoom,           {0} },
//      { MODKEY,                       XK_Tab,    view,           {0} },
        { MODKEY|ShiftMask,             XK_c,      killclient,     {0} },
        { MODKEY,                       XK_f,      setlayout,      {.v = &layouts[0]} },
        { MODKEY,                       XK_x,      setlayout,      {.v = &layouts[1]} },
        { MODKEY,                       XK_y,      setlayout,      {.v = &layouts[2]} },
        { MODKEY,                       XK_t,      setlayout,      {.v = &layouts[3]} },
        { MODKEY,                       XK_m,      setlayout,      {.v = &layouts[4]} },
//      { MODKEY,                       XK_space,  setlayout,      {0} },
        { MODKEY|ShiftMask,             XK_space,  togglefloating, {0} },
        { MODKEY,                       XK_0,      view,           {.ui = ~0 } },
        { MODKEY|ShiftMask,             XK_0,      tag,            {.ui = ~0 } },
        { MODKEY,                       XK_comma,  focusmon,       {.i = -1 } },
        { MODKEY,                       XK_period, focusmon,       {.i = +1 } },
        { MODKEY|ShiftMask,             XK_comma,  tagmon,         {.i = -1 } },
        { MODKEY|ShiftMask,             XK_period, tagmon,         {.i = +1 } },
        TAGKEYS(                        XK_1,                      0)
        TAGKEYS(                        XK_2,                      1)
        TAGKEYS(                        XK_3,                      2)
        { MODKEY|ShiftMask,             XK_q,      quit,           {0} },   // logout
};
/* button definitions */
/* click can be ClkLtSymbol, ClkStatusText, ClkWinTitle, ClkClientWin, or ClkRootWin */
static Button buttons[] = {
        /* click                event mask      button          function        argument */
//{ ClkLtSymbol,          0,              Button1,        setlayout,      {0} },
//{ ClkLtSymbol,          0,              Button3,        setlayout,      {.v = &layouts[2]} },
//{ ClkWinTitle,          0,              Button2,        zoom,           {0} },
        { ClkClientWin,         MODKEY,         Button1,        movemouse,      {0} },
        { ClkClientWin,         MODKEY,         Button2,        togglefloating, {0} },
        { ClkClientWin,         MODKEY,         Button3,        resizemouse,    {0} },
//{ ClkTagBar,            0,              Button1,        view,           {0} },
//{ ClkTagBar,            0,              Button3,        toggleview,     {0} },
        { ClkTagBar,            MODKEY,         Button1,        tag,            {0} },
        { ClkTagBar,            MODKEY,         Button3,        toggletag,      {0} },
};

Any suggestion is appreciated!, NULL };
static const char *browsecmd[] = {
 
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