Email Override Issues

-- HikaShop version -- : 6.4.0
-- Joomla version -- : 6.1.0
-- PHP version -- : 8.4
-- Browser(s) name and version -- : Firefox 149.0.2
-- Error-message(debug-mod must be tuned on) -- : Forbidden You don't have permission to access this resource.

In reviewing my email overrides, I have run into two issues.

1. I am unable to save changes to any of them or even click on the Cancel button without getting a "You don't have permission to access this resource." error. I checked file and folder permissions and those look proper. I have to download the files via FTP, edit them and upload to get around this issue.
2. When trying to "See Modifications", while using the dark theme, the text is unreadable. The dark theme is not being applied. I have to switch to light theme so see them.