I have the same problem. I edited the desc.php file to have it display the field’s label instead of it’s value. It’s a quick hack but it helps. Of course, I have to add the code every time NF is updated.
Original Line 86
<<?php echo $desc_el;?> class="<?php echo $field_class;?>" id="ninja_forms_field_<?php echo $field_id;?>_div_wrap" style="<?php echo $display_style;?>" rel="<?php echo $field_id;?>"><?php echo $default_value;?></<?php echo $desc_el;?>>
Modified Line 86
<<?php echo $desc_el;?> class="<?php echo $field_class;?>" id="ninja_forms_field_<?php echo $field_id;?>_div_wrap" style="<?php echo $display_style;?>" rel="<?php echo $field_id;?>"><?php echo $data['label'];/* EDITED was $default_value;*/?></<?php echo $desc_el;?>>