Unfortunately, it appears that the same little bug also affects the Totals that are displayed on 'The People' section - particularly the 'Master Guest List' and 'Invited All Day' totals. So to ensure that the totals are indeed correct, just do the same as for the previous bug and make sure the Attending switch is set back to NO before setting the RSVP switch back to NO,
Fix already complete and will be available in the upcoming v1.3 update which should be coming very soon.
A big thank you goes out to one of our brides to be, Pippa, who helped so much in finding this bug.
Regards
Dave Roberts
iWedding Deluxe Support