Support Specialist 3 challenge

Hey

The first part of the challenge is done. Got my 2000 damage with the airburst. However yesterday I did the Revive X players in a match and completed it shortly before the map ended. I am 100% certain (as is my brother who was also doing it) that the required revive count was 20. I repeat, 20. Now today it is no longer completed, and the requirement is suddenly 50? What is going on?