Game has reset?

Just logged back in after being afk for a few hours. My main character seems Ok, still paragon 95, all gear Ok etc but everything else isn’t. The maps are all blank, I’m back at the starting location, the npc is there with the first quest, I know no waypoints, it’s a mess! None of my other minor characters are affected but main main one which had finished all 5 Acts is now shown as being at the start of Act 1.