...
I suspect it has something to do with the footprint wizard, since all of those components were made using that. The vertical connectors pictured were made manually (using a STEP file on the manufacturer's website) and those persist through Altium restarts. I've tried looking this issue up online extensively, but I have not found anyone with the same issue (or I'm not using the correct search terms). The only other forum post I found with it is here, but there are no replies on it (as of today 11/7/2021). If anyone finds a permanent solution to this, please update this page.
UPDATE 2-12-2022: This issue has been fixed in new versions of Altium (22+)