This wouldn’t be a theme issue as the breadcrumbs are coming from WooCommerce itself.
I would recommend going through some basic debugging tips like disabling all plugins except GP Premium and WooCommerce to eliminate conflicts from elsewhere.
If that doesn’t help then I would recommend checking with WooCommerce’ support team to see if they can offer some pointers.
Hi Leo,
I deactivated all the plugins one by one and the issue is on GP Premium plugin. I deactivated your plugin last, so I’m almost sure the problem is there.