Oh no! It sounds like they aren't fully baked when they're being taken out of the oven, causing them to collapse in the center. We'd recommend testing the center of the cake with a knife to check for any wet batter or crumbs before taking it out of the oven. Sometimes a toothpick doesn't give a good enough view of the inside.
The type of pan you use can also make a difference in baking time and consistency. Check out our blog post on Glass, metal, and stoneware pans if you're curious.
If you're finding the edges of the cake are baked before the center, that's a sign to lower the temperature and give it a longer, more even bake. We hope the next one turns out better! Annabelle@KAF
May 30, 2018 at 11:48am
In reply to I just baked a cake that I have baked at least a dozen times. … by Cindy (not verified)