ZFS FreeBSD 10.1, external HDD, encryption install, USB flash disk, pass error

I install FreeBSD 10.1 on Western Digital external HDD with full encryption and ZFS file system, my external HDD connect to my mainboard with USB cable.
Every time I boot my system, it need password and I can use FreeBSD. Everything is good. Yesterday I attach USB flash disk with fat32 file system to another USB port and my system start boot , but when it need pass and I enter password I see error about wrong password and system can not accept my pass. After 4 try, my system need pass for ZFS file pass and it can not accept password. But when I unplug USB flash disk, and reboot system again. It accept my pass and I can use it. I do no know why I have this problem.
 
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After boot when I attach USB flash disk everything are good and my system work good, but when I attach USB flash disk before boot, this problem happen and system can not accept my password. After boot I can use USB disk and I can use it for copy and paste files.
 
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Could you describe your setup a little more detailed: which encryption, what partitioning etc. I had a similar problem last year and it turned out to be a buggy BIOS. So please give more info about the setup and the hardware as well.
 
I think this is bug, when I attach USB flash disk and boot system. FreeBSD can not accept password and say password is wrong.
 
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