Some times it happened to me if I upload an item with combinations size S, M, L, XL, XXL and color white, black, pink
having pink only in S, M and black and white in M, L, XXL
it can happen that S, L and XXL don´t show properly even if you select the right color.
It means I have to fill all pinks in L, XL, XXL to 0
and white and black S to 0 so they show properly. If I don´t fill them I got that problem
That is a mess because many items don´t come in all the sizes.
And there are a lot of items.