Some things to note besides the ones already mentioned:
Some statistics are not updated in real time.
ScribbleHub is meant for original english novels, and while you can host translations, it won't show up on the frontpage or anything. And if you have it linked via novelupdates or something, chances are, they won't be adding it to an SH reading list, since they'd have added it on NU.
You can check how many readers you have by going to the statistics tab and looking at the recent readers section (where you have one person as of this writing), which matches the number you currently have, since recent readers is updated in a timely fashion