Numerical Problem in List-Editing Mode

Dear IMDb

I am experiencing problems with one of my lists: https://www.imdb.com/list/ls046891728/. In list-edit mode numerical-order does not display correctly - (some numbers are repeated and some numbers do not occur at all). This makes for list-editing, where positioning of new titles is crucial, a real nightmare.

Your help in regards to this issue will be much appreciated.

Thanks in advance.