Sign Seal is set in field flag for a Rich Text field

I have created a rich text field programatically, but the field flag is set to ‘Sign Seal’ instead of NON SUMMARY. Why this is happening How to set the field flag to NON SUMMARY?

Subject: Sign Seal is set in field flag for a Rich Text field.

I’ve never seen the field flags of a richtext item actually showing NON SUMMARY. SIGN SEAL indicate “Sign if mailed or saved in section” and “Enable encryption for this field”. This is the default behavior of RT fields created in the back-end.

What kind of problem does it cause?