I was the one who did that. On the AO3 end the disambiguated version of the tags are associated with other fandoms. So say "Tony Stark (MCU)" even with the disambiguation is showing up under Marvel 616. I've gotten tired of fighting, disambiguating, and having them still wander. I'm not going back and changing anything that is staying put, just wanderers and new nominations. I'm just tired of dealing with hoping every MCU character will stay put so I've decided to use ridiculous disambiguations.