Related child records not pulling to pdf

[Nicholas_black]

Hi all

Hoping someone can help me. I recently copied my app as migrating all our IT to google workspace. I had some templates setup that where and still are working in the old app body for pulling related items to a pdf but these on the new app are not coming through. All the info from the parent table is showing but no child records. 

Any hepp would be appreciated. 

Thanks

Nick