I thought this might clear after the Valentines quest was over but no. All my mines are stuck at 199 and never go down. I've been through the quest sequence at least 3 times and it times out every time. Starfall is Donald Ducked
Have you checked in storehouse if you have reached the max shards you can collect?
It has a very low max limit, 2-3 and 6k AFAIK
If you have hit the maximum storage space for em, you will need to make a reward box in the forerunner to make space for em as mining stps when storehouse if full