Quote Originally Posted by mc12345678 View Post
Based on that and a brief review of a plugin called quick updates, the issue is oversanitization when submitting content through the admin where the sanitization code has been applied. The plugin appears to offer sanitization processing, but it appears to apply only strict sanitization which is applied even if no sanitization rule had been added... At any rate, the issue is not with ckeditor but instead the plugin(s) associated with what is being seen.
Thankyou kindly for your reply. That makes sense, I will approach the relevant support thread and see if I can find a fix. I haven't updated quick updates for a couple of years, though I noticed this occurred after one of the recent zencart updates and perhaps that file was altered. I have it with 'proforma' module too, but I will figure it out I am sure (hopefully lol).