I did a clean installation of Leap 15 with KDE. After installation, updates were installed, the system rebooted, and now I get a message in Software Updates saying there is an update for Firefox OpenSuse-2018-512(1). When I click on install, it downloads but says Firefox 60.0-lp150.2.2.x86_64 isn't installed. Firefox 60.0.1 is installed. If I try to remove firefox with zypper, it says it isn't installed, but it is and I use it without an problems. If I try to install Firefox, it confirms it is already installed.

I have deleted the .firefox folder, rebooted, and the system automatically installs Firefox 60.0.1.

What is causing this and how can I rectify it?

Many thanks