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I was able to reproduce that issue on your form. It seems that there is some conflict between a field label and a signature canvas element, in order to fix it please try to set a field label alignment to the 'Top' value.
If you need any further assistance, please let us know.
Forcing the field label to "top" does correct the problem. To test, I changed it back to "auto" and even though the label was at the top the problem came back.