From the “I Should RTFM More Carefully” Dept.:

I screwed up the redirects on my end, so I effectively had them in twice, which, well, caused everything to loop back on itself.

I may change the identifier, but after this point, I have complete control over how things look and what gets published, (favorites, replies and boosts show up correctly while I can still publish my reads and other non-fediverse stuff without it going to the fediverse as just a link).

Thanks for letting me know about the problem, because I then had to sit down and figure out what was going on and I caught the mistake.