Interestingly I'm not having this issue if I use Nuance PDF converter.
This is correct, and working as designed.
If you use the same field name on two pages, they are the same field.
So, if you combine two documents with the same field name, they are the same field, and will have the same contents.
This is a key reason why PDF portfolios were invented.
Very helpful thanks. Off chance which portfolio would be the considered the closest to resember a single file format?
Thanks again for your help