It is not just you. It does not work right. However, one of the ways you can compensate is with the Settings using negative or positive dimensions
another way is how save it that is too complicated to explain, but I had better luck saving it as an object ( was a morph), then as a nob.
The issue is kind of related to morphs not knowing which side is up and also a perfectly vertical rotation. If the the morph has a vertical rotation of .01 off of plumb it will give a very different result than at perfectly plumb. That sort of thing. I typically use nobs and handles that are independent objects.
But you can get what you need using a custom nob.