You pose a perturbing question because of the dates. That is the breeding published in Modern Roses at least back to 1958. The first Modern Roses (1930) does not list the parentage. By Modern Roses V (1958), the next that I own, the parentage is shown. If it is an error and you have a more accurate reference, we'd like to include it here.

Speculations? First, that the breeder (Dickson family bred both roses) didn't release Charles J. Grahame (the actual date may be 1905, not '06) until after it was used it for breeding for some time. Another is that this breeding information is qustionable. See the link to Colin Dickson and the reference to the destruction of breeding records in a 1921 fire. Furthermore, some breeders were known to be less than truthful about the parentage of their roses, a kind of early intellectual property rights protection. I have no information that the Dickson family ever engaged in that practice.