Searching for an installed extension returns a newer version than the one installed

Steps to reproduce:
1. Create a subwiki and install there an extension (e.g. Forum)
2. Install the same extension on the Main wiki
3. In the Main wiki downgrade the extension to a previous stable version
4. Go to Installed Extension
5. Search the extension and try to uninstall it

The Uninstall button is missing because we are looking at a newer version than the one installed.