I’m with you on this. For the majority of my life, I never sneezed more than twice in a row. It was so weird and once I noticed this, I paid attention every time I sneezed to see if I was right. If I didn’t get it the first sneeze, the second sneeze was gigantic to make up for it, and then done.
At some point in my 20’s, I broke through the two-sneeze barrier and now the number varies.
I’m sure your body knows why.. I wonder if there’s something genetically or physiologically that makes this happen.