https://wccftech.com/apex-legends-update-1-1-wiping-progress/

Apex Legends has just released it’s latest update, but it seems the patch introduces more problems than it fixes. Apparently, patch 1.1 is resetting some players accounts, knocking their progress all the way back to level 1. Respawn has already acknowledged the issue, and is recommending players not buy or craft anything until a fix is delivered. It’s probably best to avoid downloading the update altogether.

We are aware and looking into the issue with accounts losing their progress after the update today. Will provide update ASAP.