No, that's not normal at all. Something very abnormal going on there!
If the parents both had the bloodred (diffused) gene, I would say it might be caused by that gene, but the parents aren't from what you state and snake itself doesn't seem to be either. The photo is pretty grainy and unclear, but aren't a couple saddle blotches at the very bottom also lacking some pigment? Are the head scales otherwise smooth and normal looking?. It looks almost wrinkled, but it's really tough to make out in the pic.
~Doug