Flowed subforms, field overwrite (revisited)

Object hierarchy and properties
 
Main form
- flowed
- allow page breaks within content
Sub-form
- positioned
- text field 1
- allow page breaks within content
- text field 2 In the middle
- allow multiple lines
- allow page breaks within content
- Height : Expand to fit
- text field 3 + other objects
 
Am I missing something as the data from text field 2 is rendered over consequent fields ? Tried every trick, eg. each field as independent subform.
 
Thanks in advance
Erkki