I'm unsure how the whole cross-posting thing works, so I'm copying my comment from a cross-post here too, let me know if this is bad and how to approach cross-post comments correctly.
I had the same problem. Yesterday I could access the modlog from the lemmy.ml instance but it had a lot of repeated entries. Like a lot.
So yeah, something's weird. On the lemmy-ui issue tracker there's this: issue#1905 but I haven't had the time to read it, I only skimmed it.
Theyve been sending federation events with times far into the future. So far that it breaks the lemmy frontend. Theyre federated, so obviously it breaks it on every instance