Bug in Notifications User role selector

I am using the notifications feature of your plugin to send out emails to a particular user role (contributor) when a post is published. On the edit screen for the notification, the drop down selector for user role defaults to “All Users” and selects every user role instead of showing the actual user role already selected. When you change this to one particular user role and publish, it works as expected, but if you then edit for instance the content of the notification email and save / publish, it will also set the user roles back to “all users” and ticks all the checkboxes for every user. I just found this out the hard way when I sent hundreds of test emails to all the live users on my website.