Table balancing is a nessesary thing in MTTs, because its not fair, if one table has 6 players and another 9. In top of that tables have to be added or removed, as the number of participants go up (during late registration) or down. And in small field MTTs this can sometimes lead to players being moved around a lot, if for instance the tournament is hovering between 4 and 5 tables during late registration. Someone bust, and a table is removed. Then 2 minutes later a new player enter, and a table has to be added. And so on and so forth.
The players to be moved are picked completely randomly, so sometimes we get moved more than the average player and othertimes less. This is basically just another kind of variance like the fact, we sometimes get dealt many premium hands and othertimes none. So yes getting moved is completely normal, its just part of the game, and it does not happen to OP more, than it does to any of his competitors. Its not some fancy way for the poker site to make sure, OP dont win. In fact they dont care at all, if OP win or lose. They only care about collecting the tournament fee