Don't understand how that could be happening and can't really tell because it would seem you have disabled the extension on your forum.
Have you installed any other extensions?
What version of phpBB are you using? It looks like 3.2 which hasn't been released yet.
EDIT: I have pushed a new version on github. https://github.com/rmcgirr83/topicicono ... girr83.zip
You will need to uninstall the extension, delete the files from the extension directory, upload the new files and then install the extension.