There is a known issue with today’s world merge on the PTR. We have found during our internal testing that in rare cases, some players will fail to persist after logout and their progress will revert back to the start of their last play session. We already have a fix for this bug in hand, but unfortunately it was not found in time to be included within this PTR build version. Rest assured however that this problem will be fixed in-game before merges take place on our Live worlds.
If you experience any other oddity or bug post-world merge, please be sure to report it to us below so that we can continue to investigate and bug fix before world merges go live in the near future. Thank you for your cooperation and assistance!