Italy sort by Reference in My Collection is broken

Italy sort by Reference in My Collection is broken, as you can see, KM 96.2 is before KM1.

Rather than start a new topic more or less along the same lines, I thought I would just add to this one.

I just added several items to a series, and I have all 50 of them. Why would the sorting order be different when the only setting changed is My Collection: in?

Here is the search in the first photo