I have checked the attached schematic and checked the oscillation and it is present even I removed most of the blocks and left the 1st block after the STAGE_ONE node.
I tried to understand what type of filters you have in the circuit.From the input, you have used band pass filter.You have also multi feedback filters on the middle blocks.But I am not sure what type of filter you have on the 1st block and last block.
Maybe it would be helpful it you can tell us more about your application. What is your target bandwidth of interest and input signal level and desired output.
Thanks and regards.