Am I getting all these shares? really?

I have a Shopify web store and recently I installed the app "share this" just your regular share app. And I'm getting a lot of shares, so many I begin to be suspicious that they're fake. I mean I get about 20 - 30 a day and I don't even have that much traffic. The only way that would be possible is if for example someone shares on FB and then somebody share the FB shared page. Could share this be giving me fake shares so I'm happy?

Thanks