trouble changing our signature

Altough I have updated our profile and signature, when I submit I am told my email address doesn't match the confirming email address. I have tried many times and when I preview all looks good. But upon submitting, I get that message. Help!

 

I had that once; I think (it's been a while) I either used a different computer or just a different browser. Likely cookies or something like that holding onto stale info...