Ayman,
I'm not sure where that 'gb.' is coming from. My guess is that the Pinterest Javascript file that we load is prepending that value to the URL for some reason (it could be a language string or just meant to redirect some traffic to other servers for better load balancing).
If you open the HTML of your page and search for pinterest, the only code you'll see from JFBConnect regarding that button is:
<a href="//pinterest.com/pin/create/button/?url=http%3A%2F%2Fdriver2driver.me%2Fprod%2Fcars%2Freviews%2Fitem%2F82-fiat-500l-2014&media=http%3A%2F%2Fdriver2driver.me%2Fprod%2Fmedia%2Fk2%2Fitems%2Fcache%2Faaa082d2257ab65aecf61c2340e9c5b9_XL.jpg" data-pin-config="none" data-pin-do="buttonPin" ><img src="//assets.pinterest.com/images/pidgets/pin_it_button.png" /></a>
That text is what we put there. Pinterest's own Javascript can alter that however they want. We don't have control of what they're doing.
Again though, even with that prefix, it is working for me, so the gb. likely isn't the direct problem. There must be something between your monitor and Pinterest itself that is causing issues with the gb.pinterest domain. That could be:
* Browser issues (add-ons causing conflicts)
* Software issues (anti-virus, anti-malware)
* OS issues (firewall, incorrect internet settings)
* Router (firewall, incorrect DNS settings)
* ISP (blocking of some requests)
* Even further up internet stuff well outside of your control
I really don't know what it could be, but again, everything seems right and is working from my end.
I hope that helps narrow things down, but I'm pretty clueless as to what could be causing your issues.
Thanks,
Alex