Round time glitch

That is actually now normal. There is a new rule change for Assault Maps that started with this patch. If both teams have more than 2 minutes time is deduced from both time banks until the team with the least time remaining has only 2 minutes. This ensures matches remain competitive but not risk playing out into multiple rounds. Just remember that no matter what the team with the greater amount of time will still have the same amount of extra time after the adjustment.