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The form width and embedded iFrames do not match since there is a lot of CSS involved from each form. Unfortunately, I do not think that we have any easy solution here, we will probably need to add lot more CSS to make it work somehow.
The current issue on your form is the Submit button. You will need to remove it from the main form, and then add the Submit buttons to each embedded form.
In other words, users will need to submit embedded form instead of the main form. Otherwise, you will not get any data.