Well Jodie, there's lots of reasons that your stats may not appear correct. Are you getting them from our site first of all? Although others like statsman, etc. are doing a great job with tracking stats and such, please do not rely on their accuracy. I could easily unwittingly make changes that would 'break' their parsing, for example, and that could produce misleading results. I must ignore all reports of incorrect stats unless they have been observed on the 'official' site.
Also, on the official site, it may sound dumb but you need to shift-click on Refresh on your browser sometimes to force a reload of the GIF with your stats in it or it keeps old ones. Please verify these two things first. Then compare how many structures you make over a period of several days. Remmeber the program only uploads every 3-4 hrs probably on each machine so depending on how they are staggered it could look like you are producing more one day than another, because they may uplaod, say 5 times one day, and 7 times on another day.