I have noticed similar problem with the "Scores & Stats" page. Specifically "Home Page > Scores & Stats > Statistics > Plane > Melee Tour 258 2021-07-01 to 2021-07-31". Look under the plane P-39Q. I had something close to 50 kills in the P-39Q up until about 3 days ago. There was a blip and everything reset to zero. Since that day I have racked up 7 kills but the page has lost the data from the 1st to the 5th (Approx.) of July.