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I have checked your form and I can see you have changed the default widget's size, it seems to keep the same size in the email notification.
I added a new E-Signature widget and the size seems different, the one you already have in your form shows smaller, here is a screenshot about it:
Are you getting the image different on your end?
Could we get an image about how it looks when you're receiving it?
Please do let us know, we'll wait for your response.