So apparently IW lowered the base XP rate from 900, which when doubled would give you 1800, to the base XP being 400, which would give you 900. The normal base XP.

If you are interested on reading more about it you can find it on reddit

https://www.reddit.com/r/modernwarfare/comments/hkfmoj/the_2x_xp_and_tiers_are_fake_all_xp_has_been/?utm_medium=android_app&utm_source=share
 
Or this Forbes article

https://www.forbes.com/sites/paultassi/2020/07/04/a-warning-about-call-of-duty-warzones-broken-double-xp-weekend/amp/#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s
 
Another good one from IW.

I don't know if it was intentional or not but I noticed it myself the first day. I just thought it wasn't working like it was supposed to work. Wouldn't be the first time their game didn't work the way it is supposed to work. I did report it as a bug. Seems to be working correctly tonight though.

I was wondering about that as the XP seemed lower than normal.

Those of us at 155 haven't noticed...
Oh, did I say that out loud???  :lol:

GT is just showing off again. lol

Right on GT........and won’t be long before others join the 155 club!

Just for the record.. I don' t think IW is "cheating."  Rather, IF it's true than it's a code issue.