I have installed google maps and have used the option

I have installed google maps and have used the option to link it to a custom field in my case "post_code" when used on a locla server it is working fine as it generates different maps depending on the custom post. My macbook is giving its location to the browser. However when I load it up to production server it is center the map on New York rather than Hunstanton in the UK. I presume I need to change one of the javascript files? If that is the case can you let me know which one or is there another solution maybe I'm not checking the right box? I need maps at a zoom level of 15 or higher