Oh my goodness… THANK YOU! I’m sorry to have bothered you with issues caused by another plugin.
Although that plugin was already Deactivated, I deleted that plugin entirely, and all is great now with the Contact Form.
That WP Super Cache plugin had been deactivated for quite some time. I didn’t know it could still place code like that when deactivated. Can you tell me, is that normal, or is that the result of a problemed plugin?
Thank you again.