[Optimus Vader]

Does anyone know if at some point they changed up the VC's Stormtrooper helmets? I've had about a dozen for a year or so and they all have yellowed helmets. I bought four from Five Below this year, and of course they're white at the moment because they're only two weeks old, but the eyes on the helmets are clearly painted differently. I didn't notice if I was buying Stormtroopers from different waves when I was buying or opening... didn't think of it... they're Stormtroopers.

All of the Stormtroopers I already had have their eyes painted all the way up to the black band around their helmet, but the four I got this year have a break. Wondering if this is just a paint difference or if the helmets are changed because they corrected the yellowing (you could even call it "blue-ing") issue?