I belive that I have stumbled upon an error in the TopKarma module.
In my profile stats, my caching karma is currently displayed as 0.92. This seems reasonable given 2477 finds on my caches divided by 2689 I have made on caches owned by others. So far so good.
However, when I check my position on the TopKarma module, I am listed as having a caching karma of 2.19.
They can hardly both be correct. It would seem that the one on the profile stats page is the correct one, and that the one in the TopKarma module is wrong. Somebody should probably look into this at some point.