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If you see things like the graph below, it's highly likely the power supply is not properly connected or there might be internal break points in your circuits.
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Signal Saturation
When characterizing your filter circuit with AD2 bode plot, think carefully what's the expected gain and adjust the signal amplitude feed into your circuit accordingly.
The power supply to the OpAmps are +5V and -5V, if the amplified signal magnitude is over +5V, the saturated part will be capped off, and you will notice a warning message at the top left corner:
Reduce the amplitude to avoid saturation:
(The GUI might display slightly different on your device, amplitude selection could be on the right panel. )