Hi Ofer,
I suspect you did not run the config scripts post the upgrade.
# rm -f /opt/kaltura/app/base-config.lock /opt/kaltura/app/base-config-generator.lock
And follow: https://github.com/kaltura/platform-install-packages/blob/master/doc/install-kaltura-redhat-based.md#upgrade-kaltura
or https://github.com/kaltura/platform-install-packages/blob/Kajam-11.2.0/doc/rpm-cluster-deployment-instructions.md#upgrade-kaltura for a cluster.