Why HTML (DOM) is generating for my Multi Choice Options control in Nintex

I am using Nintex Development 1.11.3.0 with SharePoint 2010 and I am running into kind of unusual Issue.

When I create any Multi-choice option in my form, the HTML script shows me "on" as a value for all the options. i.e. <input value="on"/> as you can see HTML for my choice control and what I am expecting is What other people have. Does anybody know how I can fix this?

Thank you in advance.