In the Other Menu Items subsection of the browsing section in the manual, an example is given about the reposition option:
For instance, if you have five cards and you want to move 3, 4, and 5 between 1 and 2, selecting this setting would cause the cards to end up in the order 1, 3, 4, 5, 2. By contrast, if you turn this option off, 2 and 3 will get the same position number (and it will thus be random which one comes up first).
The issue is with the part about turning off the Shift position of existing cards option;
It seems that the new position numbers will be as shown below instead (2 and 3 don’t have the same position numbers):
Watch a demo here.