The Insignia slots of three of the "winter" mounts are inconsistent with, well...every other mount in the game.
The general rule is like this:
- Orange (Legendary) 140% mounts have one fixed insignia slot and two "wildcards".
- Purple (Epic) 110% mounts have two fixed insignia slots and one "wildcard".
- Blue (Rare) 80% mounts have 3 fixed insignia slots.
- Green (Common) 50% mounts have one fixed insignia slot and one "wildcard".
Well, there are three mounts that violate this, and if you are even slightly OCD, this is extremely irritating.
First, there is the Royal Winter Sled.
It is a purple 110% mount, but it has only two insignia slots, like a common green mount.
Second, there is the Frozen winter Sled.
It is a Blue 80% mount, and again, it has only two insignia slots, again, like a green mount.
Finally, there is the Twilight Yeti.
It is a green 50% mount, but it has three insignia slots like a blue mount.
The other winter event mounts, including the Demon Sled and the Frozen Demon Sled are fine.