I have a hidden form field that has a default value. If I enable the get value from query string, it works. The problem is that when I go to POST the form, it puts the value in there twice when the query string is present. When it is not present, the default value is used (only once).

With query string: vendor=test&vendor=test

Without query string: vendor=vendorNotKnown

I also changed the field to remove the "get value from query string". This is what I get then.

With query string: vendor=vendorNotKnow&vendor=test

Without query string: vendor=vendorNotKnow

What gives? If using a query string, it should override the value and only put it in the HTTP post once. What am I doing wrong?