I can't record the length of 10secs or longer of my problem  with syncing so the only thing I can do is describe how long I would have to wait until my world is synced and I'm brought back to world selection and when entering, I don't have to wait for a long time to play on My World. The only way I can explain it is: Imagine that you accidentally clicked cancel while your world was being before playing it and when you leave said world, the loading bar doesn't fully sync your world because you didn't sync it before entering it. This is the problem I have except, the unsyncing happens on its own sometimes and those grayed out worlds are the world's that were affected by the bug I'm posting about.