He is a big boy, so he has that extra layer of fat there. His skin seems to come back up and almost cover the head. I have not tried to force it so far. I was assuming that since it would naturally retract if he had been intact, that maybe that is what it will still do. No, the foreskin that is left intact is naturally fused to the glans.
Retraction occurs gradually in stages.
Usually, full retraction is not possible until somewhere between the ages of 3 and 5. It can take much longer though and that in itself is not a problem. First, I will remind you that I am not a doctor or medical professional. It is difficult to say with complete certainty exactly what your son's situation is with limited information sight unseen. It sounds like the foreskin remnant is trying to do its job of protecting the glans.