What will happen to my Pecan tassies if I use too much butter?
I'm assuming your stick of butter is 8 tablespoons, right?  So you used four times as much butter as the recipe calls for, which is probably enough to make it into a buttery mess.

I think your two best options are: 1) increase all other ingredients by the same amount and make a lot of tassies, or 2) start over.