It does seem strange. I have found these 2 parents on several censuses both in England and Canada, with 11 other offspring, but he doesn't appear on a single census with them, nor does he travel from England to Canada with them when the family emigrate in 1872. I have a DNA connection with someone who we think descends from him (and records would back this up), but we are both stumped as to his exact parentage and why he isn't with the rest of the family.
It doesn't help that it looks like the DNA connection is via my unknown GGF (who I am trying to identify using DNA).