The capacitive touchscreens sense distortions in electric field created when we touch them with our hands. AFAIK while charging due to electromagnetic fields due to current produce unwanted results. This is why many phones act weird when charging, especially through a non-stock charger. You have nothing to worry about as this behavior is normal. If your phone still acts weird, even after plugging out the USB, clean it with water, it'll be normal again!
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