I am new to the fediverse, and could have misconfigured my docker image. But, I have de-sync issues the same way. What I started doing is browsing other Lemmy instances directly. Because my subscription does not seem to pull all content and all comments. It picks and chooses to sync about 4 or 5 post out of the ~50 a day from my 6ish different subscriptions.
I am not totally sure how the software talks back and forth between instances. But, it seems like a huge issue if instances don’t have a feature to stay in sync.
I am not sure exactly how that kit goes together, but you can really use anything non conductive. If you take the back plate off you can use a vinyl sticker/tape of any kind. Once you put the back case back on it would do a nice job form fitting and staying even after the tape loses its stick.