I am using Nintex Forms for SharePoint 2010. I have a Choice column in SharePoint using checkboxes and calculated value in the Nintex Form to show the value of the checkboxes selected. when I create a new item the calculated value is showing the correct value for the selected checkboxes (ex: [Choice 1]). However, when I go back to edit the item there is an empty array element on either side of the choice I selected (ex: [,Choice 1,]). Looking at the length of the array in edit mode shows that the length is 3 when only one item is select. If I selected another option the array fixes itself.
If I use a Nintex Choice control which is not connected to a SharePoint Choice column then this bug does not occur.
Any ideas why this is happening?