Sorry to bump an old thread, but I'm experiencing this issue too.
It appears to be a conflict with Wordpress' Jetpack plugin. It is adding Open Graph tags for my store's hompeage to all my store product pages and preventing me from submitting individual URLs to Facebook. When I deactivate Jetpack plugin the problem is solved. Ideally I would like to keep using Jetpack plugin because I like the features.
Any idea how to overwrite these tags when using Jetpack plugin? I don't think the plugin allows me to selectively deactivate the tags just on my store page.