Change of policies or Player LVL Bug?

I should have been lvl 50 by now, I logged in today to play terraria and Surprisingly I am lvl 12, I played little more to hopefully fix the “glitch” but instead it moving to lvl 50 with more than 130.000XP it progressed to lvl 13. I immediately went here to report a bug. Or It’s new policies? Thanks in Advance.

Explained on Trading System last page