Fwiw I see two posts in your profile on the webpage version of Lemmy, this one and "Why does it take so many clicks to block communities?". Perhaps other posts were removed due to moderation policies?
I do not use Sync for Lemmy though, so the app malfunctioning could be another avenue to explore.
So it was an issue with the app after all:-). If that entirely solved your issue, then great. It sounds like it did!:-)
Just in case if not though, you can check out your profile from a browser by visiting https://sh.itjust.works/u/Peppycito - I see 4 posts there, 2 to this magazine, so if there were supposed to be more, it would have to be a moderation issue.