To reproduce the issue go to Administration > Monitoring > Policy Templates then choose any log policy
Choose the Edit Policy Template Option
On events section when searching for a specific rule using the search option, and then do a little change (or even without doing any change), like adding something to the display name, then click on SAVE button, a new policy will be created but will remove the unselected rules
Only with 1 rule, the other 2 policies were removed.
Issue is solved with this hotfix OCTCR19G690583_2019.05_10.80_IP1