Tweet by Respawn here
https://twitter.com/Respawn/status/1775215429289742754
We've seen your reports about account resets in @PlayApex and are investigating. We'll let you know as soon as we have an update on the issue.
For now wait for updated statements from Respawn
Due to the spam of almost identical posts reporting these issues the subreddit may be set to protected in the meantime to clear the backlog (no new posts, but comments on existing posts allowed).
There's no need to message modmail about this (either removals for rules on duplicate posts or not being able to create new posts).
Comment the issues you're experiencing in detail below, as it may help Respawn fixing the problem.
Two most commented on posts about this
https://www.reddit.com/r/apexlegends/comments/1bu3yng/account_level_and_stats_went_down/
https://www.reddit.com/r/apexlegends/comments/1bu3ydx/all_stats_erased_during_split_reset/
UPDATE April 2, 9:13 PM UTC see stickied comment
UPDATE April 3, 09:00 AM UTC
https://twitter.com/Respawn/status/1775447745526149510
External link →We messed up! In order to resolve an account data loss issue, we are temporarily taking the @PlayApex servers offline. Fear not! We are deploying a fast fix to restore progress and content to affected accounts, but players will not be able to connect to the game during this time. We’re hopeful that the game will be back up in about an hour. Stay tuned for more updates, and in the meantime, please accept our apologies, and our thanks for your patience!