Keyword disappearing..Please Help!

I contacted you months ago and this is an urgent issue. On my most important page where the keyword should be Raleigh Wedding Photographers, everytime I put in the keyword, update, it literally disappears. Other pages are fine but not my Galleries/Weddings page 9the most critical page.

I have already reinstalled plug in.

http://www.leahmarieimages.com

Thanks for your help!

https://wordpress.org/plugins/wordpress-seo/