Bakers - I need cake help
Why do my cakes sink in the middle????
How are you checking to see if the cake is done? Are you confident about your oven temperature? Are you baking the cake on the rack suggested in the recipe? I'm wondering if it's underbaked and that's what's causing the sinking.
Just off the top of my head, your problem may be either undercooked or not enough rise, i.e, baking powder/soda.
Go to baking911.com, click on "cakes", then click, to the left, What Went Wrong. Sarah Phillips gives several reasons why cakes sink in the center. Her site is a treasure trove of baking info, for novice as well as experienced bakers. I think you'll find everyone's reply thus far in the What Went Wrong section. Hope you find your answer!
Without know how you bake your cakes, or what you put in them, it's impossible to answer your question.
Just off the top of my head, I can think at least about a dozen reasons why cakes sink.
Tell us more, and we'll be able to give you (better) guidance.