Make sure you're clear with these dates
http://blog.wenxuecity.com/blogview.php?date=200708&postID=19650#Dates
If the "Received Date" is beyond I-94 expiration, you'd better contact USCIS to fix the issue as it is a reason to deny I-539.
http://blog.wenxuecity.com/blogview.php?date=200708&postID=19650#Dates
If the "Received Date" is beyond I-94 expiration, you'd better contact USCIS to fix the issue as it is a reason to deny I-539.