Check Box data NOT been collected consistently by Acrobat XI Pro

Question

Hi folks
I'm having a real problem with Check Box data not being processed consistently by Acrobat XI Pro. 
I've got 140 response forms back - and have processed them in one batch or smaller batches of 50 forms.  I can see the various check boxes ticked in the pdf view but on some forms that data does not get exported to the csv or xls.   For other forms it works fine. 
I've tried various exports, even opening one returned pdf form and exporting that alone.  All with the same result.
I'm at a loss to the problem. 
The original form is at:
http://www.orchardrevival.org.uk/wp-content/uploads/2014/02/Orchard-Inventory-Survey-form- v2-superceded.pdf
Any pointers would be very welcome. 
thanks
Crispin

Answer 1

Thanks for that George. 
Corruption:  If the file is corrupted, do you know why Acrobat doesn’t report this?  There was no indication of an error in this respect. 
Method: I have followed your suggestion. Opened ‘BORD0008checkboxissue.pdf’ in Acrobat ProXI.  Export as .fdf.  Close all files.
Open a blank form in Acrobat Pro XI.  Import the fdf file. 
Result;  The newly filled form is still missing checkbox data.  Result file at http://www.orchardrevival.org.uk/?p=798
[ I also exported as xfdf and xml and csv, and looked at these files in a text editor. Neither had the correct checkbox data exported.  Therefore I think it is clear that Acrobat Pro XI is not exporting checkbox data for this file to any format]
Does that shed any more light on what might be the problem ?
thanks
Crispin
Background to document:  An outline form was created on Word Mac 2008, and then a pdf generated with the Save As pdf in the Word dialogue (which I think may have been an Mac OS based generator). 
Then the fillable form was created complete with all 143 fields in Acrobat Pro 8.  Then distributed by email.  So despite the fillable form being created in Acrobat Pro, the PDF Producer is reported as Mac OSX 10.n.n Quartz PDFContext for all forms.  However some of them work, some don’t. Obviously I do not have control over how the forms are filled out there in the wild – even though I’ve asked folk to use Adobe Reader.
I’ve tried processing results with both Acrobat Pro 8 and XI with similar inconsistent results. (a further interesting issue is that the filename stated in the record is incorrect for that record)