Ultimate Facebook - sharing post to facebook bring up except from another previous post

When "sharing to facebook" most of my posts display the except from this post:

http://nlm.yanick.me/foxfire/

this post should not display that except but it does:

http://nlm.yanick.me/dubin-ellen

this post displays no excerpt (which is what I want for that post)
http://nlm.yanick.me/price-connor