I have a Trello account and also have access to two Jira sites, an old cloud Jira site (which I forgot I still had) and on premise server JIRA Software site.
When I connected and validated my JIRA user email address, it connected my account ((Which I use for Confluence) to the Atlassian site and the JIRA cloud site instead of the JIRA server site and I cannot find out where to change or disable this connection in Trello.