Those events are really inefficient, I would rework all of them and possibly destroy planets or set their position back to default as they fly on forever. It's probably something to do with the planet being on collision with the sun so it adds more than 1 to the variable. On question 12 you are adding 2 to question no. by the way. I would look at using Families, this would help with your events and grouping all planets, you have 200+ events there that could be just 20 and easier to manage.