Radio Group buttons 'In Unison' not working

[devcat]

Create a radio group with 3 options, all set to the same field name.
1st option has value 'Dog'
2nd option has value 'Cat'
3rd option has value 'Cat'

I set the 'In Unison' flag to 'Yes' for all three widgets.

Save file and open pdf in a viewing app.
When you select 2nd or 3rd option i,e, 'Cat' they should both be selected i.e. 'in unison' as they have same field name and value

However, this does not work in firefox, chrome of adobe reader.
Is this a bug with PDF X-Change, pdf readers or just my computer?

EDIT: it does work in adobe reader, please ignore post

[Dimitar - PDF-XChange]

Thank you for your feedback.