Board Thread:General Discussion/@comment-29003089-20160713040444/@comment-28391659-20160713075808

To answer your question, I think that they are decided by the author, so maybe they forgot to match it.

P.S: Biologically, there are also chances that she resemble her grandparents or her earlier ancestor instead of her parent. So maybe the author decide to made Asuna resemble her grandparent.