Apple Fitness App - Monthly Challenges not accurate

For the past two months, I have completed my rings every day and have met the monthly challenges but in the middle of the month all of a sudden the challenge disappears as if I can no longer complete the challenge because I have not met the requirements. Last month it was to complete my move ring 20 days in a row. I never missed a day all month but my challenge disappeared on Day 13. This month I needed to complete my rings for 27 days. My challenge disappeared yesterday but I have closed all three rings every day. Please advise.