No he is still a baby I think they manifest when they hit puberty or something like that so we don’t know yet
but what chase was small baby he had his purple eyes
We don't know that yet. Only in a dominant x dominant pairing the offspring is 100% dominant.
They turn purple when they manifest as domianant alphas, before they have a different eyecolor. The exception are born manifested like Grayson, those are born with purple eyes, but that is extremely rare.
To your other question, the manhwa adaption probably intentionally didn't change it, because they aslo ignored that Chase wore colored contacts and an eyepatch for his movie role.
His eyed actually should have been blue (like their dominant alphas father's orginal eyecolor), the eyecolor of his siblings is correct. Chase is the only sibling that manifested late. His other siblings already had purple eyes at Chase's age.
I have a question, if pete eyes aren’t purple, does that mean he is not a dominant alpha?