Event handler type mismatch

Hello,

We have FMG v6.2.1 with Fortianalyzer. The issue we are having is with Event Handlers in "Incidents and Events". We can create new handlers and they work as expected but any attempt to modify them result in "Event handler type mismatch". Unable to disable or delete them as well. Rebooting did not resolve the problem. So we are no stuck with some test handlers that generate emails. I couldn;t find any reference on how to modify event handlers via cli. Any thoughts on how to fix this?

Thank you