Oh boy. It's something you will figure out later.

Nothing changes to your players 3 minutes before the match starts. Your cant recover conditions and morale, change formations and instructions, nothing. So that's what happened.

It's not a bug. It happens to everybody. If your match would start at 10:08AM, your last chance to make changes on formations, morales or to have conditions recharge was at 10:05 ;/

Better luck next time.