Vehicle Repairs not tracking

One of my weekly challenges is to Repair Vehicles for 1000 points (or xp or whatever). On the first day I managed to get 178. But the following day, all vehicles I was trying to repair weren't counting. The vehicle would repair but I would not recieve any XP nor would the challenge progress. I tried restarting that game but no luck. Could be a possible bug and I'm not sure if I can fix it from my end.