Your filters are not correct. A Butterworth filter has a flat response then a drop off as sharp as the number of poles. Your filters are not Butterworth and have only two poles.
A second order filter has two poles and drops off at the rate of 12dB per octave.
Your lowpass filter has capacitor values ratio that causes a peak at about 400hz instead of a flat response. For an opamp with a gain of 1 the capacitor ratio should be 2:1 for a Butterworth flat response.
Your highpass filter has a droopy cutoff since its resistors do not have the 2:1 ratio needed for a Butterworth flat response. The 1uf capacitors are huge and expensive and could be smaller and less expensive if the resistors have higher values.
The TL084 has noise. The TL074 is low noise and costs the same. They have a minimum supply voltage of 7V so your 5V supply is too low.
You have two bias voltage circuits when only one is needed. The junction of the three 1M resistors should have a 1uF filter capacitor to ground. The resistir in the highpass filter must connect to the bias voltage, not to ground.
The input capacitor cuts frequencies below about 80Hz and should be 0.022uF (22nF).
Here is how the filters should be:
A second order filter has two poles and drops off at the rate of 12dB per octave.
Your lowpass filter has capacitor values ratio that causes a peak at about 400hz instead of a flat response. For an opamp with a gain of 1 the capacitor ratio should be 2:1 for a Butterworth flat response.
Your highpass filter has a droopy cutoff since its resistors do not have the 2:1 ratio needed for a Butterworth flat response. The 1uf capacitors are huge and expensive and could be smaller and less expensive if the resistors have higher values.
The TL084 has noise. The TL074 is low noise and costs the same. They have a minimum supply voltage of 7V so your 5V supply is too low.
You have two bias voltage circuits when only one is needed. The junction of the three 1M resistors should have a 1uF filter capacitor to ground. The resistir in the highpass filter must connect to the bias voltage, not to ground.
The input capacitor cuts frequencies below about 80Hz and should be 0.022uF (22nF).
Here is how the filters should be: