If the difference is just a small amount, it probably is that the glans is swollen so much during your erection, it is adding to the overall bpel, while the bpfsl the glans is not swollen.
I think it probably has to do with girth to length ratio, or the size of the glans when erect. BTW, my measurements are pretty close together. I have a pretty large head when erect, and decent girth. I'm curved, too, when erect, which may have an effect on the difference between flaccid stretch and erect length.
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