I remember the previous thread on this, because I was the one who mentioned why that jump in issues occured. It was indeed SWATPro. When they stopped publishing SwatPro, they counted them in the regular GamePro count, which was dumb even though Swatpro was mostly made up of stuff from the recent previous GamePro issues. At least that is what I remember reading. However, there were more than 10 issues of SwatPro, so maybe I am remembering things wrong. I do remember EGM criticizing GamePro for jumping their issue count by 10 because they stopped putting out SwatPro, or something along those lines.
Maybe they counted SWATPro seperate from SWAT, which preceded it. I just wish my question on GamePro's site would get answered.