Lightroom is saving my edited photos double

Every time when I save my edited photos, Lightroom saves them double, triple... and right now Lightroom is saving every photo ten (!) times. (^*^@) I wanted to save 150 edited photos and yes... he's making 1500 of it. What to do? He does this every time (but everytime a different amount). I can ofcourse delete 90% after, but it takes a lot of time (and storage).

I have a mac and the files were RAW and he makes them JPG.