[Plugin: Add Link to Facebook] Caption Option Issue & Previous Posts Questions

I had clicked the checkmark next to the “Use Site Title as Caption” and then decided that I didn’t like it on the FB posts because ours is long… So, I unchecked it and saved it. However, any NEW posts still publishes with the caption on it in Facebook. What am I doing wrong?
Also, another question while I’m typing… When going back and saving old posts in WP as a draft, saving, then re-publishing it so it will post on FB-It isn’t publishing on FB as of the date the blog has it posted on, it’s showing current date and time. Is there a way to fix that and I’m just not seeing it? thanks! great plugin!

http://wordpress.org/extend/plugins/add-link-to-facebook/