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No problem bro, feel free to ask if you have any other question

so the missing header is technical data? Did you do as I recommend in the 1st place to make another field group? Or send me your detail I can check

try to reorder the field group that has missing header to below and check

Try making a new few group and add the fields to that new one. I think you 're using common one I'm not sure but template hide header of that field group.