What you're experiencing isn't a hack, it's a problem with the game. Possibly due to the maintenance, but those kinds of things happen from time to time.
The SvS, it is probably a glitch, whether the other team did it intentionally, accidentally, or it was a problem on yours, or Disney's side, we can't tell. But I'd assume it was a problem on Disney's side.
When you sail, if your pirate goes "/afk", you do not receive any of the treasure gathered during that time. I think that someone may have gotten treasure, but if not, it is a problem on Disney's side.
Quests sometimes offer gold, rather than rep. That could have been the case, if not, it is only 100 or so rep, so no big deal if it only happened once
Freezing in mid-air is probably something on your end. Either that, or the games. You could have been laggy, or about to be disconnected, and that could have led to this happening.