Resend of form shows unexpected internal data

When I resend a form that contains checkboxes an additional set of data (that looks like a dump of the associative array) is printed.

e.g.

Original email:

Long-term commitment, Specific Events, Over 18

Resent email:

Long-term commitment, Specific Events, Over 18, {“opt556436″:”Long-term commitment”,”opt2845673″:”Specific Events”,”opt6840942″:”Over 18″}

Can you fix this?

Thanks

Graham