Site Works In Preview But Not When Published

I used the code from this thread…

…to successfully filter a Wix Pro Gallery based on a user’s selection from a drop-down menu. It works just how I want it to in Preview mode, i.e. all photos are displayed initially, and when a user chooses an option from the drop-down (just using “title” to get it working), only the photos with that title are displayed. When I publish, I don’t see any photos to start with, and the drop-down works, i.e. I see the options, but selecting an option and pressing “Go” does nothing.
I saw a similar thread that said to sync the data (did that) and make sure dataset is read-only (did that) and make sure collection permissions are set so ANYONE can read (did that).

Any ideas?

Here’s preview mode initial state:


Here’s preview mode after I choose a title and click the “GO” button:


Here is the live site initially, and after you make a selection and click “GO”:


I really appreciate any help!

Here are the perms for this collection:

Update: several hours later, my live site works! It must have been slow Wix severs. Is this a known issue? ie taking servers time to update with new published site to catch up?