That is a hard name to pronounce!!
First, thanks for the cool post.. it's very cool to see someone breaking down the scores like this -- almost like a detective trying to solve a mystery.
The irfanview shortcut is exciting FARR because of this substring:
IrfanView - Thumbna
Now ideally, and clearly, your mbna.rfp should have won with a highest score.. 99 times out of 100 farr would be smart enough to rank it on top. Initially i thought the history might be what is causing it, but you said already both are in history.
I have an idea.. could you try disabling the non-contiguous search option and see if that lowers the score:
If it is that, then its a bug in that. If it's not that then maybe i will try to reproduce it.