Why does the emulator exclude the last 2 characters of Game ID in various places?

[Kolano]

Those final 2 characters indicate the games publisher...
https://wiki.dolphin-emu.org/index.php?title=GameIDs

The first 4 are sufficient to uniquely identify things, so they are sometimes omitted. I think there are also some particularities around how the values are stored between disc images and downloads that result in these discrepancies.