https://www.zazzle.com/collections/christmas_cards_and_labels-119548050520505677
Why are some of the gold foil cards displaying this way? so weird.
you added them to the collection via their individual product page as opposed to from the backend (via Actions > Add to Collection).
see here for a detailed explanation on how to correct the thumbnail used in the collection.
https://community.zazzle.com/t5/technical-issues/selected-photo-for-products-not-showing-correctly-in-collection/td-p/44159
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Actually, mine did that even though I added them from the backend. Unless I’m only publishing one or 2 items, I almost always do it from the back end- I select a bunch at once and add them to the collection all together.
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I had that problem when I added cover photos to my products. What I did was go back into “Edit Details” and even though the correct cover image was showing, selected it again, and then when I clicked done and refreshed my collection, the image was fine.
ahh … another wrinkle I didn’t think of.
Hi all,
This is an issue that we are aware of. We are investigating but unfortunately we don’t have an update as of yet.
Thanks for your patience.
Pádraig 
thanks to all who helped in this, it worked!
Yes, thank you! This workaround is great, however T E D I O U S !