Hey, Not all stat trackers can be equipped on every emblem, so you may need to use a different emblem if you wish to equip that specific stat tracker. It's also possible that the emblem is bugged. I believe there's a few Iron Banner emblems that don't take stat trackers at all, and a couple of the activity specific emblems this season couldn't equip stat trackers for their respective activity, though I think that last one has been fixed.