Isn't it great how people with an answer don't check the numbers to see if it applies to the problem first? Well, I should talk. With my limited ability to code, I did the same thing more than once over at the SupCom forums.

The only thing I can suggest is that either it's a bug, one of the kids got distracted somehow very near the research table so that it looked like they made the drop and they didn't, or you mis-counted. I absolutely hate making a developer error my first assumption though, since I once did that alot, and was wrong almost every time. (Unexpected! It must be a bug!)