My hedgehog is called Hoggle
YES! All the time.... I put down the puppy pads as her toilet and when I wake in the morning she's asleep under them and no matter how many times I move her gently to her bed, every morning, it's the same thing, she's back asleep under the puppy pad instead of her bedIts very possible. You said you tried a different detergent already. One other thing you could try is to try double rinsing them or run them through a wash with no soap to remove additional residue.
One other item of thought, does she liner dive? Does she ever go under and sleep on the bottom of her enclosure?