screwed down squeaky sub floor, causes warped sub floor

Before replacing the carpet in my bedroom I cut the carpet and screwed down the sub floor to quiet down the squeaks.
Weeks later, the tiled floor in the bathroom adjacent to the bedroom now has a slight bulge upwards. The bulged area is about 6 inches away from the closest screwed down sub floor.
I guess screwing down the sub floor prevents them from moving horizontally due to moisture expansion.
If I cut slits between the sub floor boards with a circular saw, would that allow the floor to expand without bulging? Or should I just remove the screws and live with squeaks?
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On Wednesday, September 9, 2015 at 6:51:23 PM UTC-4, Bob wrote:

They probably didn't leave the required gaps between sheets to allow for expansion. Still seems unusual that just screwing it down more would cause this. I'd certainly try doing a relief cut, you would think that would work, if that's the source of the problem.
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