This will probably be fixed soon.
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It looks like there is a new server-wide hack or exploit going around in Call of Duty: Warzone at present. Players have reported joining hacked lobbies in various Warzone game types that will instantly level up their weapon to max level (70) after earning just one kill.

According to a post on Reddit, streamer Dr Disrespect encountered this hacked lobby weapon boost earlier today. Another streamer, TimTheTatman also found himself in one such lobby earlier today. The resulting clip from TimTheTatman's stream was shared on Twitter via CharlieIntel.

Several people replying to the Reddit thread say that they also encountered the same hacked lobbies at various times over the past day. These lobbies tend to appear more often in the Plunder game type as well as in the BR Quads mode.

These hacked lobbies come mere days after Activision's new Ricochet anti-cheat went live around the world.

Noen of the official Call of Duty social channels have mentioned this exploit yet. However, I would say that it's a safe assumption that this will probably get patched fairly quickly.