Every form element is supposed to have a label for accessibility. These labels can be done explicitly or implicitly.
Explicit example:
<label for="firstname">First name:</label> <input type="text" id="firstname">
Implicit example:
<label>First name: <input type="text"></label>
link to WAI info on labels: https://www.w3.org/WAI/tutorials/forms/labels/
This is probably an upstream problem from a form plugin?