Hi Niall, thanks for your reply.
The website is usually only viewed at landfor.org except for users in the USA (redirected by IP address to a USA specific site). The USA site is a different site and the twitter share is only intended to count shares of landfor.org. The bit.ly link is used as the initial redirect as a quick solution because the link was failing to work in the redirect plugin.
Does this complicate matters? I’m not entirely sure what to try? I have already used the data-counturl parameter to http://landfor.org/ in the second test (link 2 in original post). Grateful for your advice.