I have noticed posts going missing every once in a while and not sure if I'm doing something wrong or if it's a known issue.
For example I wrote a short welcome post for https://lemmy.world/c/dnd but I can no longer see my own post on my own account. But if i log out and navigate to https://lemmy.world/c/dnd I can see the post is there and fine?
Check your language setting has all the languages you want selected and ALSO has undefined selected too. V important and it's been causing a lot of issues, definitely needs looking at by devs.
Could it be based on your language settings? I saw someone mention that setting your language to undefined makes you see all posts. If you set it to English for instance you might not see posts that haven't specified it's language as English.
That may totally be it. When I began posting I didn't understand what that selection was for and just selected English. I'll mess around with it and see.