Can’t collect a XP? [COD3] [zombies]

I’m not sure why,

Whenever I play matches- I can’t collect XP anymore-

It says on my level bar that 0 XP needed til next level- and no matter how many kills I get or how many rounds I make into the game- I can’t collect my XP to level up anymore?

It just started happening out of nowhere?

Does anybody know why?

I tried searching up reasons as why-

I don’t play modded games and I haven’t been reported- should I report as a bug? How would I do so-

Any thoughts are appreciated-

(I just started a match and let myself die right away to show the XP bar. I’m level 35 and it says 0XP needed til next level- I haven’t been able to collect any XP steadily over the last 5 matches I played)