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That looks like encoders are not sending anything. Or nothing is being received on processor side.
Do you have a CRO?
If not, try to measure voltage on A & B with multimeter. When encoder shaft is not moving, you should read 0V or 5V, this will depend on shaft position.
When the shaft is moving (reasonably fast), the voltmeter should show ~2.5V.
Also, try to reset processor.
Are you typing "Q" or "q"?
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