Why does Meltlilith has slightly different eye colour than the rest?

Unbreakable said:

Why does Meltlilith has slightly different eye colour than the rest?

Melt always has blue eyes. (and Lip's are pink but that's harder to notice)

Grisoni said:

Melt always has blue eyes. (and Lip's are pink but that's harder to notice)

I just wonder why she has such big difference compared to the others when they are basically the same person as far as I know?

Unbreakable said:

I just wonder why she has such big difference compared to the others when they are basically the same person as far as I know?

I don't know for sure, but both Melt and Lip are composite characters of various goddesses on top of being off-shots fom BB, so that might have something to do with it.