List not working

Hello. I've just added a new item to my list. Then I edit it and put this new item as order number 1 and then save it.

Ok, once this done this item was moved to the order 2 and the old order 1 was moved also to order 2, leaving the list without oder 1. In addition, the small image for the list disappeared. This is my list :

https://www.imdb.com/list/ls527546638/

Please, could you fix it and find a way to prevent this issue ?

Thanks a lot