Mine kept resetting my progress too. Not quite got the mount unlocked yet, but I know it kept resetting the bar. My catalyst quest did it twice too! Didn’t just reset, dropped the quest twice so I had to pick it up 3 times and complete it in one go to make sure it didn’t do it again! Opened a ticket and got a generic response of ‘relog and drop quest and try again’
Friend of mine had her progress reset when at 850, however now it says she has claimed all rewards for this month, but she never opened the chest to claim any of the milestone rewards. So if it is not fixed for her , then she will get bugger all.
Myself, I’ve got the issue where I did not get all my rewards, including the mount, after opening chest. Maybe Blizzard should change it’s name to Bethesda Games, as there are more bugs then Fallout 76.
Tbf Blizz had fixed it, with personal loot. However people wanted the old system back, so Blizzard did what they asked. Only optimistic players thought Ninja looting would not happen again, realists like myself knew the change would bring them back.
I’ve completed the whole Traders Post progress, got the message that I’ve completed it, went to click on the chest and no mount. I’ve gotten my coins yes but still no mount. Logged out for 30mins to 1 hour, didn’t work. Today I log back in and still no mount and the bar has been resetted to 0