This issue isn’t related to our plugin, but it can happen that your shop page ends on ‘www.somewebsite.com/shop-2’ instead of just ‘/shop’. Here is a quick fix.
Go to Dashboard > All Pages and locate your two shop pages. Select the ‘shop’ page NOT the ‘shop-2’ page, trash it, and then delete it from the trash. Edit ‘shop-2’ and change the Permalink slug to ‘shop’.