It doesn't work when I'm using lower value (1-99) nothing changes in that range. It's working when the value is set to 100-1000(or 10k). Beyond that number, the stage will automatically fail.
Oh and, even tho the value is 100, I only dealt 3k - 5k damage (starting character level 2 and 3 with 400-600 damage, 13 atk, 1000 matk) when it should be around 60k if it was multiplied by 100.
This image shows what happened when I'm using 25k value like you.