You use wp-register-profile-pro plugin which has hard-codded CSS with !important statement for some form fields, this adds padding: 5px !important;
to all form fields:
Here is the code we found in /wp-content/plugins/wp-register-profile-pro/css/A.style_register_widget.css file:
.reg-form-group > input[type="text"], input[type="email"], input[type="password"], input[type="url"], input[type="tel"] {
width: 100%;
padding: 5px !important;
border: 1px solid #ccc;
margin-top: 5px !important;
}
Please contact to this plugin developers and ask them remove the !important statement, this affects other plugins and your theme. they should not use it.