The stattracking bugs existed (at least) as far back as BF1 as well, but is there anything to indicate that this is anything beyond an error in how battletracker itself tracks stats? Do we know that fairfight tracks stats the same way?
Case in point for BF1 stat tracking bugs from my own profile: https://i.imgur.com/xCrGIG1.jpg
At some point it just stopped tracking hits, headshots and time used, so the stats looked increasingly crazy the longer I played