Touchscreen not working - fake touches - Transformer TF300T Q&A, Help & Troubleshooting

Hello!
After I had my tablet's touchscreen replaced, it seems to always detect touches in two places. The spoilered pic is a screenshot with Developer Options -> show touches enabled; one touch is near the middle of the right side of the screen, another on the top side. When I rotate the screen, the touch points rotate too. It only happened a few minutes after booting for the first time, but appears immediately again even if I reboot. I tried updating firmware, but nothing changed; the memory isn't full either.
The tablet's running Android JellyBean.
What could be the reason? Note that I'm not looking for a way to fix it as much as for an explanation why this happens.
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