Two things come to mind with this,
Are the upper retaining clips in the correct location and/or is there padding around the sides thus preventing the metal back from setting down into them?
Add some pics if you haven't resolved the issue and I'm sure others will chime in.
Cheers.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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