Can't enable Auto Repeat for Sales Invoice

I get the following error when trying to enable auto repeat for the Sales Invoice form…

Error: Document has been modified after you have opened it (2021-06-03 15:37:21.337418, 2021-06-03 15:37:21.409293). Please refresh to get the latest document.


Some previous changes may not be saved, clear cache, refresh the site and try to customize sales invoice.

Ran the following in the frappe folder:
bench clear-cache
bench clear-website-cache

Then signed back into the site and did a refresh and reload on the site. I’m the only user logged in. Still getting the same error…

Other thoughts?