Hi, thank you for this.
Do not see anything wrong at first glance. I honestly do not know how used to bubble you are.
When you open the popup do you send over data to the popup using the element action “Display data” in popup, or it looks like you change the URL to send data that is received in the popup?
And the repeating groups data source is popups X`s list of transactions?
Another idea: maybe data you inputted is only on live and not the demo version?
Probably best if you send me a pm with a link to your editor (Under settings then general you can make your editor view only for me or edit only, how you prefer)
I have troubleshooted many bubble apps.