@David
This sounds like what I stumbled into about a year ago.
If you go behind the scenes and change your first name in the contact information, say from David to Dave (or vice versa), it impacts all your future uploads. After the change, your artist name field when you upload new work would default to Dave Gordon instead of David Gordon unless you manually changed it with each new upload.
It doesn't immediately change past uploads, but if you edit any part of a past upload after you change names, the name field in the artist section of your artwork will switch to the new name. If you don't manually change it back, it will then save with the changed name in your URL and break links.
I discovered this accidentally because I changed my name to include my middle initial as it does just about everywhere but here in my bio. I didn't notice for a few days but every time I changed a past upload, it broke my links by inserting that changed name into the URL. I changed my name back at the time, but it's still a little issue that haunts me whenever I edit past uploads. I have to pay attention to what the URL says before I click edit to see which version of my name that past upload used.