Same modifier twice on Treacherous Domain

Is this normal? As far as I remember, this is the first time I’ve seen it happen:

Crippling rolled twice.

There seems to be some bug with the Domains, where it can, seemingly at random, roll double the intended amount of mutators than usual. And when this happens, duplicated mutators can happen. So the original bug is just a consequence of this parent bug.

The first screen was from Tomb of the Heretic (6 instead of 3).
And I just got 8 instead of 4 in Court of the Magi. Seems to be exclusive to this area? Might be worth looking into. Don’t remember seeing the doubling anywhere else.
8