It looks like JavaScript is broken for the site. This can be caused when files in the Moodle source code folder are overwritten (instead of replaced) with the 3.9.2 files which you must not do. I.e. there are still files from the old version conflicting with the new files.
Ensure that the source code folder contains only Moodle 3.9.2 files, the normal way to do this is to:
Thanks for the reply. We used softalicious to upgrade, normally the software will take care of all updates, creates a backup and installs the new software..... We will check for old files
An example of an old file which shouldn't be present with 3.9 is theme/boost/amd/src/tether.js. It's present on your site.
This forum is full of reports of sites that don't work after upgrading with Softaculous (e.g. one, two, three). Maybe it works okay for minor version updates (e.g. 3.5.13 to 3.5.14) but not for major version upgrades (e.g. 3.5.x to 3.9.x), possibly because major version changes are more like to add or remove files.
