For example let's say you want to make an avatar mastery, as we all know avatar has been nerfed to the ground so in that case if it ever gets a mastery it should have the buffs it did before the downgrades it received. Think of it as time traveling. I am not saying make the mastery benefits be only the buffs before the downgrades but let some of the previous buffs be included in them.
Basically let there be a place where there aren't any one-shots to instantly ruin your streak nor a lot of killstreak users trying to repeatedly still your kills or hackers trying to take you down. Just a place with more balances.
I feel like one more phase or 2 at best (500, 750) would be good because you got a REALLY big gap between 250 and 1.000 kills. 750 kills of the same phase is kinda boring, not gonna mention how you can easily die between those kills especially if you are in a killstreak only server with a hacker or even a regular server. I am not saying that those 1-2 phases should also get a badge but be more of filling phases just like 75 kills which has no badges, it just the in between of 50 and 100 kills phases.
I think it glitches because it has been days, maybe it's not a visual bug because other mastery banners work just fine.