There's something wrong with that number. The last listing of mine to auto relist starts with 302845 (it has the same number of digits) so yours is a LOT older number.

I scheduled a listing about a week ago and the item number on it started with 302835. Have you had your item scheduled for a LONG time and kept changing the scheduled start time? That's the only way I know of that the listing number could be so old, but I think you would have had to have stored it in scheduled for years.

Are you sure you've copied the number correctly?