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The circuit is simple, but there are errors in multisiim simulation. What happened?

Improper use of power supply voltage, the power supply voltage range of AD623 is 2.5V- 6V, and only a single power supply of 2.5V is used in the figure, so the operational amplifier cannot work normally. A single power supply is used to increase the power supply voltage. The application of the power supply voltage given in the manual is shown in the following figure: