Yep, appears to be a bug as it happens to me as well. These tutorials on parts creation may help:
I lately learned there aren’t links to the videos in Old_Grey’s tutorial so you need to do a google search for the title and then they come up on YouTube.
As noted mine doesn’t use parts editor, but in general parts creation is difficult and if you only need a part or two not really worth learning. For small numbers of parts you are better off to let one of us who is familiar with part creation make it for you by posting a request and a datasheet (with dimension and connection information for the part.)