Conclusion: the problem are the other clients and not Jumble.
Discussion
Might have been more of a relay problem
Some of the missing notifications were like reactions that show up in jumble now, which is odd at the relay level because you can't repost a like, or reply to it or anything to make sure it gets rebroadcasted - maybe it was just a relay issue that fixed itself
It could also be Jumble’s bugs. I just haven’t made any adjustments to this part recently, so I’m a bit clueless.