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My form sends input data fine.
But when I change the form processing Message: text to rich text, the email received only shows the rich text for the Message text. the remaining data of the form fails.

Changing the Message: text back to plain text, save and upload the page, then the form sends all data to email correct.

You will need to include the variables yourself. eg:

Email: $email

Comments: $comments

Or, whatever you have named your own form variables.

This is intentional behavior to give you more control over the message text.
If you use Rich Text when you will have to use variables to include the values.

Please see this related FAQ:
https://www.wysiwygwebbuilder.com/forum ... 10&t=64476