I have no idea why. I'm not changing the way I mix my batters. I haven't changed the recipes.
I've done the hot water baking powder test.
All my ingredients are fine.
I sift my dry ingredients.
I cream my butter and sugar at the beginning to ensure that air gets incorporated.
The only thing that I could think of is that my cake pans aren't exactly straight. They are kind of outwards, like this: \\_/
Also, one has a random dent on it on the side, I have no idea how it got there.
Also, I barely get a bump in my cakes anymore. :/
My most recent cake was only two inches high after I filled it and frosted it. It looked pathetic in my opinion.