Digitizer on iPod 4 Touch partially working

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Months ago when the top of my screen was broken off and the digitizer had snapped, i had purchased a replacement tools and a new screen from IFixit, and after several hours i managed to replace it (but unable to set it properly due to dents). but however months later, after the replacement the digitizer seems to be malfunctioning, as parts of the screen do not work, and these non-functioning areas seem to fluctuate location on the bottom half of the screen.

any ideas on what to do? (set the digitizer again, new screen. etc)

Also: after using a site to test the touch responsiveness, it seems that in those trigger areas, the digitizer detects input from another source (as if you place two finger on it) with this image i am using two finger on screen, but it registers 3

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