I am currently experiencing the same issue as described above. In the list of added services on the services page of my repository, nothing happens when I click on the "x"-button to remove the service. I tried with Google Chrome, Firefox and Safari (latest version each) and experienced the same issue on all three browsers.
I created a duplicate Issue Service in the first place and cannot remove it now from the list.
Hi Martin, I do notice behavior similar to what you describe. Enabling/disabling issues on a repository automatically enables/disables the issues service. Still you should be able to manually disable the issue service while keeping issues enabled. I will look into this some more and come up with a fix.