While this could be a bug of some sort, what is typically the case is that you accepted some beast tribe quests on a previous day that you did not complete. The counter will not reset and you cannot accept any new beast tribe quests until you complete all beast tribe quests (from any/ all tribes) that you accepted on a previous day.

First thing to do is check your journal. Beast tribe quests have that 'repeatable quest' icon so they stand out a bit and the potential areas where they could be are limited. If there are any in your journal waiting to be completed you can either go and complete them or abandon them. Whichever course you take the counter should immediately jump to 12 and allow you to accept new quests for today.