@Gargron Specific things I've noticed is following a whole lot of accounts I never actually followed myself, particularly a lot from sex-focused instances, as well as the website link being changed to some subdomain of a site like nvyk.ru or something, which is decidedly not my site.

Given I see no indication from anything that any security issues have arisen, and that my password here is good, I'm presuming some crossposter or 3rd party bridging thing may be responsible, they had permissions