Photoshop: After "undo", different layer are selected

Often when I undo a step in Photoshop, a different layer is selected from the layer I was working on. How can I turn off this super-annoying feature?

It even happens after I've done several steps on the current layer but only undo one step. WHY would it jump to a layer from 3 steps ago?

Brett Gilmour
Brett Gilmour Photography