Overwatch 2 Season 4 introduced a new ranking system to the game — on top of the controversial hero Lifeweaver — that would no longer cause seasonal rank resets and rank decay. However, due to miscommunication between the community and the developers, players are seeing rank changes happening in Season 4 and contributing it to rank decay,

Source: Hot Hardware – Overwatch 2 Season 4 Ranking Glitch Sparks Gamer Outrage And A Blizzard Investigation