All custom fields empty in CSV export

Thank you for great work with the RSVPmaker. It works really well in almost every aspect. I have however one frustrating issue which I just cannot sort out.

I have set up an event (our wedding) with all the required fields. When I fil in the form the answers are stored for every field. However, when I export the CSV, only the default fields first, last, notes et.c. display the stored information. For the other fields, the column header is correctly presented in the CSV, but no data is filled in. All the fields there are empty.

I Run WordPress 5.3 with the latest version of the RSVPmaker 6.4.3

As you may understand, the timing is a bit tight so I need to get this solved before we invite the guests. I really hope that you can help me.

Thanks’

/Tomas