Parts making is complex and tends to bite without warning. Learning to make parts well takes a considerable amount of time. These two tutorials (which you may be aware of, they get posted here a lot ) may help and apply to current versions of Fritzing. It is also useful to be aware that parts editor was not finished when development stopped in 2016, and while development is now restarted, parts editor hasn’t been finished yet. FritzingCheckPart.py (which will check and correct your part for various errors and svg editor limitations that Fritzing doesn’t like) can 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.
) may help and apply to current versions of Fritzing. It is also useful to be aware that parts editor was not finished when development stopped in 2016, and while development is now restarted, parts editor hasn’t been finished yet. FritzingCheckPart.py (which will check and correct your part for various errors and svg editor limitations that Fritzing doesn’t like) can help.