Polished granite andesite and diorite are not sortable

Using an automatic sorting machine design by redstone inovation on youtube
https://www.youtube.com/watch?v=KT8KPoF3jx0 link to design. after setting up the sort program in the hopper using 19 1 1 1 1 of polished granite, polished diorite or polished andesite it will sort all 3 types in to same hopper. i have tried in both single and multiplayer.