WP Facebook plugin-problem

I have site with demotivacional poster,and in WP every post is 1 poster(picture),but expect that poster ther are 2 arrows (one for next poster and one previous poster) problem is when I instal Facebok share plugin (+meta) It make me problem when someone click share as thumbnail it set arrows (instead of poster),also when someone copy url of post and write on facebook same problem of thumbnail-HELP ME!

Your post does not make much sense. Make sure to add more details, maybe pictures (if you don't have a good grasp on English) so that you have better chance of getting help.