Q: I’ve noticed that when I bake boxed cake mixes these days, they don’t seem to rise like they used to. I end up with very flat cakes. Do you have any idea what could be going wrong?Sharon Thompson, ColumbusA: Assuming your mixes are not out-of-date and the leavener in the mix has not gone flat, I suspect you are the victim of shrinking cake mixes.There was a time when all cake mixes were more than 20 ounces.For a while, most remained steady at 18.25 ounces, but [...]