Why are my fingers so fat?

This is a sizing ring from the sizing kit Oura sends you when you want to buy one of their sleep/health tracking rings. I apparently have plus-sized fingers because I had to use their size 13 sizing ring and this was the largest in the set. And it doesn't even fit properly -- look at all that excess flesh bunched up on the lee side. Maybe I can do finger folds to tighten things up.