<facepalm> I wouldn't have thought of that but it makes perfect sense. Thank you very much for the tip on the Bengal Snow.
I'm using 2 different boys - 1 for each Tawny girl. One Tawny girl is spitting out the Ocicats & Cream Tabbies and the other is spitting out the Siamese Flames & Cream Tabbies. Okay, so it's not my imagination that the breeding seems to be a little 'off course'. So both girls must be hiding something other than what they appear to be since the Flame and Ocicat is coming from the mothers. Well, dang. Nothing is ever as simple as it appears to be.