We have a fix coming in the next patch that will fix this issue (for future people it may have affected or for people already affected), but in the meantime, here is what you can do to avoid it:
If you skip the combat victory screen when you hit level 6, there is a chance that it wont unlock perks for you. We recommend going through all the victory screens if you are around getting level 6 just to be sure this bug doesn’t hit you. I hope this helps! Truly appologize for any effected by this!