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I have inspected your form and all product items are aligned.
I noticed that some of the field are not aligned inside of Form Builder.
But they are aligned inside of Form Designer and on your live form.
I am not sure why all fields are not aligned inside of Form Builder. Probably some CSS code of form builder is not correct. Considering that fields are aligned in live form you should not change anything on your form. Form fields will be aligned for your users.
Let us know if you need further assistance.