From SB "Roles" view.
I select single role, click tab "Object Grants".
Select 3 DELETE grants, and click "Revoke selected object grants"
I get this message and click OK
Screen refreshes and these 3 DELETE grants are still there. If I refresh one more time, they are still there.
Same issue when I select 2 DELETE grants.
It works only if I select single DELETE grant and click that button.