heres some ways, not sure if it helps
1) Take out the ocd and the wah, connect only these 2 pedals, try putting the wah before and after the ocd, try to hear if theres any difference
2) If you have another wah pedal, replace it in the long usual chain of efx and see whether is it the same as having the rmc in it
3) Put the wah pedal in the long chain, before and after the ocd to try out.
If all the above three tried already, go back to 1), replace the ocd with another drive pedal and try the rmc wah before and after it to see if it behanve the same way as having the ocd in it.
lastly, less likely perhaps, the battery or adaptor of the wah?
imho