If you are looking at your list of submissions (or one of your users is) and you are seeing the submission ID under the name of the request on the my request list:
This indicates your submission label has a problem in it. To get to the submission label, you need to have the access/permission to Edit Form within form management for that particular form.
Then you can use the back arrow in the upper left to get to the general form settings to see the submission label:
This will likely contain a field no longer on the form. You will want to update it to contain valid fields using the drop down provided.
It may also contain static text if that is desired. Once this contains only valid fields (for any fields), the request list should display the specified label: