An odd bug has cropped up in Warzone, resulting in players' kills and wins not being properly tracked in the Barracks. The Warzone community has responded by finding a temporary fix of their own.
Warzone Community Find Temporary Fix for Untracked Kills and Wins
Call of Duty Warzone's in-game stats in the Barracks that keep track of crucial stats like kills and wins are not being properly tracked.
Interestingly, using a third-party stat tracking website like WZ Ranked or WZ Stats will present the player with their true stats. Similar to League of Legends' op.gg. Make sure to make your stats public, which will then allow you to see an accurate and comprehensive breakdown of your Warzone stats.
Neither Raven Software nor Activision has gone out and commented on this stat tracking error bug yet. Until then, third-party websites will be your best to find an accurate representation of your stats.