My PVZ GW2 save file has been rolled back

I purchased PVZ GW2 from the Steam platform on May 31st this year. This issue first occurred around June 20th, and it has occurred sporadically every time I launch the game and leave the EA server's multiplayer mode. The symptoms include character level drops, character statistics reversion, and completed missions refreshing again, while stars and coins remain unchanged. My Super Elite Level 8 ordinary pea shooter could have been promoted to Master after occupying the grass in a game of Wall-Nut Hill, but when I returned to the backyard, I found that his level was still Level 8. On the third day, I played a few rounds of Garden Warfare, and the pea shooter could have been promoted long ago, but when I logged in next time, he was still at Super Elite Level 8. I think this is due to a hack on the server or a new bug. Now almost every PVZ GW2 player has this issue, and I am worried that my character will no longer be able to advance at a normal speed in the future. Regardless, this issue is accelerating the death of this game