Workflow Email Address Gets Blanked Out


I have built and successfully used a workflow for sending me an email when a specific condition in a sheet is met. Because automation is sheet-specific, I copied the associated sheet (I will eventually need 700+ of these) several times and discovered that the my email address is removed from the notification, resulting in the "Unable to Run", "This action has no recipients...". I have gone back repeatedly to re-add my address, and although it seems to change and then subsequently save, if I go back and look only moments later - the address is gone once again. Additionally, even though I have edited the workflows, the "Last modified..." date has not updated since the original was created.

Any help on this would be appreciated - these notifications are critical. Do workflows have to be built from the ground up EVERY SINGLE TIME?