Headline correction not sticking in campaign builder

It keeps sending out the email with the WRONG headline that doesn’t even show in the campaign.
I’ve tried several ways to correct it. Body email changes show up when I send a TEST but
the subject line is wrong - way wrong as it says “free” - and this campaign is NOT for a free
program. It’s a paid program. Please help. Already getting the email complaints from prospects.
This stuff irks me as it costs in sales and good will. Why won’t the headline change stick?