Rearranging the order of list items is not working correctly on the site

I checked the help page to make sure I wasn't missing anything, but it's not working as described here: Lists FAQ: How can I move/rearrange the order of list items?

For ex, when editing a list if I try to move items 9 & 10 to slots 5 & 6, it will move 9 to 5 (expected) but 10 to 7 rather than 6 (unexpected).  And it's even more of a shuffled mess if I try to move more than 2.  I tested this on 2 different browsers & computers to rule out anything on my end.

However, the site should really implement the same drag & drop grab bar/handle used in the app for quick list sorting rather than having to manually type in numbers.  This method is tedious and archaic.

Thanks