those are NOT replacement nuts, if you turn them into the cube, you will see, that it turns lighter or harder. This is because the spring strength is different, purple are the weakest, yellow the strongest. also, does it look like that, or do you have one clear instead of yellow?
My Gan Air SM came with the (i think) old GES nut set. Also instead of 2 sets, with red-purple i got only one, with yellow-purple (see pictuire 1). Another thing, I noticed, was that the gan icon had some kind of ® icon on the right top (see pictuire 2, 3)
Did anyone expirience something like...
in some competitons there are stalls, like at Munich Open, where I 'm going to soon, there will be a Cubikon stall.
in general you can go to the WCA site and see if zour comp will have a stall.
my non cuber friend got himself a moyu 4x4 (he didn't even know how to solve a 3x3) then scrambled it, couldn't do it, put it back in the box and that was my birthday gift