To resolve this simply uncheck the delete override button.
 If you do not see the Delete Override Checkbox it is missing from the Page Layout. Follow the steps below to add it. 

1. Click Edit page layout Link
2. Search for Delete Over ride
3. Click and Drag the field onto the layout where you would like it to appear.
4. Save

Note: lf you are an admin making this change it will be on all page layouts moving forward, not just your own view.