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Very interesting! We need this on the Breeds, Genetics board and maybe we would get some more answers as to why this is.
This is my take on it, I'm sure someone will correct me if I begin misleading.
Male barred rocks possess two "doses" of the barring gene. It's what makes them lighter in color than females. When a barred male is bred to a non-barred female, theoretically, all offspring should be barred. They should not be as barred as the male since the female did not possess a barred gene. Therefore, each chick is given a single barring-dose by the father.
Now, when the female is barred and the male is a solid color, it works almost in reverse. The female, being the sex-determinant, will give her single barring gene to the males, which possess ZZ. The females would not receive the barring gene since they are ZW. The males from this cross, again only receive one "dose" of the barring since the female only had the single-dose to donate to begin with.
The OP's male appears darker, which indicates that it only has a single dose of the barring. When using a RIR male over a Barred Rock female, the males from the cross are mainly black with a bit of red flecking here and there. When the reverse is done, the males should be more red in color, but still have barring.
Did any of that make sense?
ETA: I'm just using RIR as an example. Any red bird could have been used, such as a New Hampshire Red.
