I have configured my pop ups to display related records. The records appear in the instant app pop-up sidebar, but do not show the correct configuration. It's only displaying the siteID value (first picture) when it should be showing what's in the 2nd picture.
Is your app public? If so can you share? If not can you select the same feature in the map viewer and the app so I can see the differences? In the example you have above it looks like a different feature?