Alright, I have PROOF of the 1/2=1 favor bug. And you can too, if you just follow these simple steps.
Repro Steps
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Go to a shrine
Donate ONE plank
Pause
Donate ONE plank
Pause
Donate TWO planks at the same time
Expected Behavior
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You now have either two or four more favor than when you started
Actual Behavior
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You have THREE more favor than when you started
And now, a little explanation. I've known about this for a while, but have been unable to conclusively prove it to myself until now. I was 13 favor away from getting an emblem. I donated 20 planks at once and was then 3 favor away. (IE each plank was worth 1/2 favor). Then I donated 3 more planks one at a time and got the emblem (IE each plank was worth 1 favor).
PS - For those of you who haven't been here that long, I first filed a report about this around 6 months ago. Nothing happened. I filed it again about a month ago. Nothing happened. But now, I have proof! PROOF I TELL YOU!