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How to install back cover properly?

I recently replaced broken digitizer and have to remove back cover in the process . when its done and i put the cover back, the tab can be visibly seen bend upwards as if the digitizer is sligtly larger than the back cover. i assume its digitizer as i bought from ebay and could be a $@$* seller but their rating is almost perfect. so i would like to know 2nd opinion if im not installed it properly

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