Hi @lotsonj. Sorry to hear that you’ve run into problems - the PhotoDune library has been going through some major changes over the last couple of months - I suspect that what’s happened is that the missing images from your collection have been removed from the library since you originally added them to the collection.
The collection total may still show the original number of photos by counting things that have other records in our system (unpublished items, rejected items, etc) - but only the items that are currently available for sale will be shown in the public-facing collection page.