Can only sell 1 style skull trophy in vending

[KR6SSY]

There are 4 styles of skull trophy and only 1 shows in the vending machine, the one on the left. I thought if I clicked on the one pictured in the vendy, the 3 other options would come up,, but they don't.

Not a bug really, but I made 5 of the ones in the middle, pictured, and I'd like to sell them. So not a big deal, just thought you should know. I mean since one can sell blood, lol.