The reason why shaking line 11 and 12 is a specification of your data logger.
The channels of your data logger doesn’t have enough isolation.
You have two choices to solve the problem.
■If your data logger has a GND terminal , Please connect the terminal to GND with wire.
The problem may be solved.
■ You have another data logger.
Please try to use another data logger and check line 11 and 12.