Attention ! Triangle when trying to add product to a Collection

[BevStuff]

What does this Attention ! Triangle mean?  I wanted to add a mug to my Mug collection, but I keep getting this Attention! Triangle that has no explanation.  Only for this collection. I can add this same mug to any other collection. Is this some sort of disfunction with Zazzle Collections?

[Scott]

Have you tried hovering your mouse cursor over the triangle to see if a message appears?

If nothing appears, can you link me to the mug that you're trying to add to a collection, and link me to the collection you're trying to add the mug to?

[samack]

It could be you are at your limit for that particular collection.  You are only allowed 300 items per collection.  You could check the collection and if it is at the limit you can choose something to delete in order to add this new and better item?  Or you can think of a similar grouping but slightly different for a new collection.  For example, if this collection is A Purple Wedding Collection you could be narrow a new collection down to Purple Floral Wedding Collection.  

[Laura]

I recently received this too. Took me a while to figure it out.

I added a few new cornhole sets to my cornhole collection. Then I went to sort the collection. Suddendly I noticed some of my bestsellers weren't showing up in the collection. So I went to add them to the collection. That is when I received the Attention! Triangle. It is because they are in the collection, they just don't show up on the collection page! The reason I know this is when I was on the product page of one of the new boards, the missing ones showed up under "other items from this collection" - only because they were at the beginning of the collection before I added the new ones.

@Scott the PID for one of the cornhole sets not showing up on the collection page: 256733391889445943