Digital Signature invalid when sign a PDF with instances

Hi,
I created a XDP document with LiveCycle Designer ES2.
This document contains:
- Some required fields (text fields, data fields ecc...)
- A Subform that user can add more instance pressing a button, contains some fields
- A Digital Signature (With a simple fields collection contains only the signature field)
I render the XDP for get a PDF (using ReaderExtensions component) by LiveCycle Workbench ES3.
Then I open the PDF with Adobe Reader X.
I compile the form and don't press on button increase the instances of Subform.
Sign the document and the signature is valid.
Now, instead, if I make the same but increase the instance of Subform, then sign, the signature is invalid...
Can the problem is the different versions of Designer and Workbench?
In past I got some problems, and sometime I resolved creating a new document and copying all the object of old form in new one... It's an ugly solution but it worked.
But in this case don't resolve nothing.
Any help?
Thank You!

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