List of lists thumbnail question...

Alright, so I made a list of my most complete lists, but I noticed that the little thumbnail generated for it has used an image I put into a few notes on one of my lists, instead of just using the main list images. I don't know if that makes any sense to anyone but me, but here is my example:

http://www.listal.com/list/watched-in-2012-trebek

If you scroll down to the "Added to" section in the sidebar (where you can see what lists your list has been added to), you will see that the thumbnail for the list called "Trebek's Master List of Lists" has the poster for 1984 as the "main" image, and then 3 stars as the "secondary" images. Not entirely sure how that happened. I guess it retrieves the images from the first item in the list or something? The thumbnail for "2012 Movie Lists I Am Following On Listal", below it, also has the same issue, using little smileys from one of the lists in that list. I've seen many other lists with this "issue" as well.

Anyway, I would prefer if it didn't use those stars, and just used the movie posters instead. Is there any way to maybe refresh the thumbnail, or reset it? It's a trivial little aesthetic thing really, but it bugs me. If not, I will just deal with it.

I hope at least some of that made sense to someone. Thanks either way!