I just lost 50k EXP?

I was playing a game of Dominion, got the monthly and some more, and ranked up to SR49. I go into forge, the game lags out and throws me into the main menu. Since then, I’ve randomly lost almost 50k EXP.

Does anyone know what’s going on?

If you went back to SR1 you lost connection to the crappy servers. When you are reconnected you will have your rank and exp back, but you can’t earn exp until then.