Do you have a specific example?
nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s you should update your strfry binary, I think you are running a version with screwy logic on filters.
Discussion
A few folks in the strfry telegram have acknowledged a bug in how dates were handled in filters. Doug acknowledged on May 3 that the bug had been fixed (screenshot attached).
Also, see this note from fiatjaf, who was doing some tests and seemed to find damus was running a version with the bug. At least, this is what they later claimed in the telegram thread.
nostr:note146yjpuqexrxmu4lzcvztzvtysv5d8vft76uuyd6puke7zjrmmayqn5lw6x
I personally find the Damus relay to have odd behavior (sometimes, at odd times) with the events it returns. I’m not in a position to provide reproducible examples, but knowledge of the bug is real.
Cc: nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 
I think the bug was that if you do {limit: 10, authors: [A, B]} it would return all posts from pubkey A before it started iterating through key B.