I've found a similar situation with some decals in 'Sky', where they look too green, or with a brownish cast. I've normally used them anyway, with a view to then over-painting in the correct shade once in place, then found they've been fine once settled and dry. I recently bought some Xtradecal 'Sky' code letter sheets, in 48th and 32nd scales, and was a little miffed to find they looked an odd colour, and different (in shade) between the scales. The latter is a good thing, as it's the 'scale colour' difference, and the odd-looking colour was fine once off the backing sheet and on the model.
I guess it's one of those situations where you don't know until you try them, but can be a bit irritating !