Board Thread:Support Requests - Getting Technical/@comment-44151016-20191029173816/@comment-9605025-20191029182406

It depends on what exactly you mean by "added one too many".

Added an Extra Call to a Page

Deleted the duplicate call.

Overwrote the Desired Version with Some Other Version

Access the templates history and revert it back to the desired version.

Multiple Templates with the Same Purpose
 * Decide which one to keep.
 * For all others:
 * Use Special:WhatLinksHere to determine if there are any links to the template and/or pages using the template
 * Change all links pointing towards the template to point towards the one you are keeping instead
 * Change all uses of the template to uses of the one you are keeping instead
 * Delete the template and its documentation page if it has one