It sounds like you're talking about times that you've typed in your own custom name (with or without prefix) and the created element winds up with an entirely different name. I'm not sure that I see this behavior, precisely.
I don't keep a log on all these things, but from memory it seems that I often when I select a certain feature definition which has its prefix set up, it is often ignored when creating new elements, but that might be different.
I don't keep a log on all these things, but from memory it seems that I often when I select a certain feature definition which has its prefix set up, it is often ignored when creating new elements, but that might be different.