Whether it does or doesn't depends on a number of things, some alone, others acting together:
1. How long or short your foreskin is.
2. Whether you're a "grower" when you get stiff, i.e. does your pik grow out of the available foreskin covering it.
3. How loose or narrow (tight) the opening on your foreskin is.
I have a very narrow foreskin that causes ne no problems and feels brilliant, so mine never uncovers the knob whether soft or stiff. Most generally, a narrow foreskin resists being stretched over the knob from birth and the pik skin grows or extends to accomodate it and the change in organ length as the boy grows through puberty into manhood.
There are degrees of narrowness in the opening, some are too narrow to slip back on their own or even with help. Others slip partially back but there is enough skin along with tightness to stop progress part way and either a helping hand or penetration finish uncovering the knob. Others are very loose and coupled with a grower uncover the knob completely when stiff.
Foreskins that stay retracted behind the knob and won't slide back forward to cover the knob are most often caused by two things, acting together or separately. First is the presence of a long frenulum on the underside of the pik connecting the foreskin and the knob in the "V", and secondly, the degree of narrowness of the foreskin tip as it has settled into the groove behind the knob.
Of course I am not writing this for blokes in the EU (or other non-cutting areas of the world) because they know themselves and if they're gay, have been able to become acqainted with all sorts of foreskins on other boys. So it is to Americans and a lesser extent Canadians that I write. To them, there are so many variables, I hope that I explained it a little well.