If I look at my results graph for 11-15bbs in the Stack Size report, it shows I have an all in EV of 2036bbs over 71k hands. If I add the filter "Allin on River (or earlier)", I have an all in EV of 4274bbs over 6k hands.
The "Allin on River (or earlier)" filter should contain every single all in hand. These are the only hands an all in EV can be calculated for. The 2 results graphs should show the exact same all in EV. I can't workout why there is a discrepancy.