Sometimes it also happens that you're in a league not so competitive and you're going to get promoted but aren't ready for the next level, so they just change league before their season ends.
Another case, I finished from a league and left with a new fitted car @ 80%, and I entered into another one that is already ongoing ... what should I do?
There has to be something in it... I've not reported this one.. but here is another account that jumps, stops for 1 race and then moves to another league for a season.. then jumps again with 1 race before joining another one.