What instance are you on?
This behavior is if your admin configured your " Content cache retention period " to have ANY value. If this is configured, remote posts will delete after the specified amount of days.
If they are a newer server host, they may have configured this without fully understanding what this is. I did the same when I first started tbh, but if this isnt configured... hmm..
Depends if they self host or cloud host, maybe their host could be doing it? depends