Stats Engine Not Working Correctly

When trying to use the stats engine I am having a problem with getting all the functions to work right. In Step 3 after clicking on any of the Red circles I then try clicking on a Yellow arrow but when I do the only thing that happens is I am placed back at the beginning of the whole process.

 

I think your idea of this engine is a very good one but if all the functions are not working correctly then it is putting a major limitation on the program.