How is it that they have so many fate points?  You said they all have a refresh of 2 - 5.  If they are compelling each other's aspects, aren't they just trading the same number of fate points around the table?  How in the world did they all end up with 10+ fate points unless you gave them to them?  If you gave them to them, then they didn't come from compelling other players.  It doesn't make sense.

What makes sense is that you started giving fate points to the compelled character without forcing the compelling character to give up their fate point. 

If that's not what happened, then please tell me how the number of player held fate points exploded.  I'd love to know.  I'm just a part-time player in a DFRPG game, so I don't know the rules as well as I'd like.