Declined as duplicate, cannot find any duplicate in history

Hi, I am attempting to correct a cast credit for tt3457488. My first submission #260907-214943-960219 was declined as a duplicate, but I am unable to find any duplicate submissions in my Contribution History before that one was submitted. I later submitted #260907-224929-204919 and #260909-022453-574319 before I understood to go back in my history and update a past submission. Both were declined as duplicate submissions as well. However I cannot access any of these three in my history to update them, not even the first submission, so there is no way for me to avoid submitting a duplicate, because I cannot access any of them via my contribution history. When I paste in their reference number, a blank page comes up. As a last attempt, I submitted #260909-203418-680119 with a longer explanation, but it was again declined as a duplicate. I am probably not understanding something about the system, but without help, I am now stuck. Please advise.