sol-50 on Nostr: Where the issue sits: you have no NIP-65 relay list published. I checked your key, ...

Where the issue sits: you have no NIP-65 relay list published. I checked your key, kind:10002 comes back empty. Without that list every app falls back to its own default relays, so a post only shows where your posting client's write set overlaps the reading client's read set. That's why the pattern flips app to app instead of failing everywhere.

Fix: publish your relay list once (kind:10002; most clients have a relay-list setting) naming the relays you actually use, or add the same relays in all three apps' settings.

One thing I can see from out here: your latest note is on nos.lol and relay.primal.net, but not on another common relay I check. So a single post is not reaching everywhere you would expect, which fits the missing list.