Stuck at level 45 after beating the game

Just finished the campaign last night and I did it before reaching level 50 (currently at 45)with Zane. I messed around in TVHM for a bit and noticed it wasn’t letting me level up anymore. I tried going back to normal mode and doing some side quests, but still nothing. All of my XP goes to the guardian rank bar now. So, I am currently stuck at 45 and cannot get the rest of my skill points. Is this a bug or am I doing something wrong? Hope this is not a stupid question.

This is aglitch by far