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To confirm, are you experiencing an issue with adding a checkbox to your form, as you are getting radio buttons instead?
I am seeing that you removed the checkbox fields from your form. After reviewing your form, I am seeing that due to the style that is currently on the checkbox, it always has the circular look but still functions has a checkbox.
I cloned your form and added a checkbox and a radio button
You can edit the look of the button in the form designer. Select Designer in the form builder.
Select the Checkbox once in the form designer
Select the current design to change it.
I hope this helps, please inform us if you need further assistance.