Cheibriados player losing piety over time

[Sandman25]

My character serves Cheibriados and has never used any god abilities but still I see piety is going back and forth from 0 stars to 1 star. I did not cast any hasty spells, did not wear any speedy items. There are no relevant messages in log either.
I tried source diving but it didn't help.
What am I missing with Chei?

Version 0.12 (I updated it yesterday and started a new game).

[ohmi]

You may just be too quick for your own good -- some species are not good for Chei because they are inherently faster than most of the monsters and so you won't get the piety increases for killing them.

[Bloax]

Except you do once you do get enough piety to become slower than them.

[tasonir]

But you can't lose already gained piety - it wouldn't go down to 0 from 1. In any case, centaurs and spriggans aren't good chei worshippers for this reason. I don't believe chei piety decays over time but I suppose it's possible I am wrong about this?

Make sure you aren't hasting anyone else - you can't haste mobs either, although I doubt this is the case. People generally only try that before slouching, and you can't do that with 1 star.

Why are you not killing lots of things faster than you are to be above the 0/1 star threshold already?

[BlackSheep]

I tested chei piety in 0.12 wizmode and it did not decrease after waiting for a few thousand turns.

[Sandman25]

I am not sure how it was possible either. Perhaps I am mistaken. Unfortunately I can't investigate it further because the character is already dead