I’m having the same problem.
In my comments, when a user adds their name, email, and comment (without a website), the comment automatically adds the website for the value of the field. It adds https://Website
<?php if(!$jquery): ?><label for="website"> <?php _e("Websites","mystique"); ?> </label><?php endif; ?>
<input type="text" name="url" id="field-url" class="textfield clearField" value="<?php if ($comment_author_url) echo $comment_author_url; else $jquery ? _e("Website","mystique"):null; ?>" size="40" />