Warped Titanium Display

I've had my PB for a year now and I am seriously questioning the 'warping' of these screens.
I was told that it happens, but once someone else said they noticed it, I thought it might not be normal.
When it is open it's not noticeable, however when closed - I can push down the top corners a significant amount pivoting off of the center latch.
Other PB's of the same generation that I've seen have almost none if any warping/bending.
What's the deal?
15" PowerBook, 1.67 ghz G4   Mac OS X (10.4.8)   1 gb RAM

I would guess the pressure and curvature of your back might do this but I'm not sure that a back pack is the issue at all.
But, mine does this "warping" to creating a lift at the outside of the front corners when closed of approx. 1/16 of an inch or so and I don't use a back pack. I'm considering putting a slim piece of something, 1/16 thick and maybe a couple of inches long along the front edge and carefully applying pressure on these lifted corners to see if I can GENTLY correct this warp.
OK, what ya think??

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