Cannot change year of release

I added release date last week. Somehow managed to type "30 October 2015" - not the correct date "30 October 2025". Now regardless of method I am not allowed to change the date! I have even talked with several people I know, and some have tried as well - the year doesn't change. It's the film "I think I love you" (Danish: "Jeg tror jeg elsker dig") THANK YOU for helping out <3 /Kenneth