Lost progress towards Old Master Challenge 1089 Eliminations gone, reset back 0

I appreciate that 

I also have this issue, 1100 gone. Many thanks

The same thing has happened to me, 1570 kills of progression lost - Gamertag : John117forever. Hope you can restore it back for us!

I had over 4K kills with maul and I lost all my progress my gamer tag is MasterCooper3

The same problem to me as well, I had over 4,700 eliminations. Please help fix this issues, thanks

I had a progress of 3,110/5,000 and now it only reflects progress made on 05/28/2020. Also created a post this morning with my information so any assistance getting my progress back to where it was would be much appreciated. 

@EA_Atic  I also lost all my progress on old master challenge. I was well over 3,000

Are you sure that this is just a glitch because I do not want to retry that whole challenge again