Multiple form fields are combined
the field names have an invalid character, open acrobat pro and change the fields so that they don't have the invalid character. in my case it was a dot (.) Otherwise, fields like Row.1, Row.2 will combine.
Check boxes not getting checked
With Acrobat Pro, Edit > Prepare a Form. Then, go to the affected checkbox field(s). For each, Properties > Options > Export Value > Change to "Yes"
PDF not reading after modifying in Acrobat Pro: Error: Assertion Failed
When leaving Acrobat, do "Save As" instead of "Save". It works 🤷♂️
Multiple form fields are combined
Check boxes not getting checked
PDF not reading after modifying in Acrobat Pro:
Error: Assertion Failed