Guild Wars 2

I’ve gotten a few extra minis of the ones I’ve already had from raid and I am at the vendor where it has the green arrow saying “I have an extra miniature I’d like to trade” and I click it and she says shes willing to trade me each one for 40 shards, and the only option I am able to click is “Never mind”

did you USE the mini? (don’t use it)
is the mini in your inventory?
are you in the correct raid wing corresponding to the mini?

Ahh I didn’t know it had to be within the same wing, Thank you!