I am trying to design a band pass filter with a third order HPF and a third order LPF but my bode diagram is terrible. How can I determine the resistance and capacitance values for an active band pass filter between 10 Hz and 500 Hz

 

You are correct to put the highpass filter at the input but the value of the 240 ohms for R3 is way too low.

 

You were told the reference website to calculate the filter values in this thread, and I showed an example circuit.
Why didn't you use that?

 

240 ohms was way too low because it was supposed to be 240k ohms.