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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I see that this is being caused by two different reasons - one is the label style setting, and the other is the custom CSS that is on that form. You should first undo the label style setting in the Designer.
Please click on the Label Styles section, and select Normal Labels in the Label Style drop down.
After that, please add the following custom CSS to the bottom of the textbox under the CSS tab:
font-weight: normal !important;
It should override the bold setting of the label fonts.
Please let us know how it goes, or if you need further help, we are happy to assist you.