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This could be a case of them cutting multiple covers at once.
I had the same problem with jeans. I order the exact same style and size, but they don’t all fit the same. When I spoke to a Levi customer service person, they said they have multiple layers of fabric piled on top. Then the cutting blade presses down, and the fabric bends. As the top one is to short on measurements, the bottom most one is to long. So you want one in the middle.
I know paper isn’t fabric, but it could be something similar. It’s speed and efficiency over accuracy.
Try using a non-alcohol-based lotion. If you can’t find one, I’ve had good success with Eucerin. I put lotion on my face and scalp right after my shower, and don’t have any itchiness or flakes.
I couldn’t find a shampoo that fixed anything for me.
If you have it on your elbows or knees (very common), you can try Aquaphor at night. That is pretty sticky, but keeps your skin calm and moist.
A dermatologist can give you some prescription lotion/cream, as well. That also works, but it’s typically a small tube and expensive.