Yes, I know there is a checkbox. But very often no breastmorphs are active at all, that's what surprises me. And that although the looks have very special breasts.There's a handy checkmark for "active morphs"
It lets you see which morphs are active.
You can then return the ones that you think are the culprit in the active list to default settings, and that usually does the job, bar a few small tweaks after.