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Thank you for sharing the schematic, this is really helpful.
I have a few tests I'd like you to perform, I suspect the issue is the input filter but let's verify this together:
Looking forward to the results.
Step one resolved the noise issue. I disconnected the output (lifted pin 6) from rest of the circuit and got a clean output signal. I believe its either D5 or C7 is loading the output. I suspected that the ESD diode D5 is loading the output but it was not the culprit.
The filter capacitor C7 on the output pin loading the output and hence causing the noise. Wondering why does a capacitor on the INA317 output pin loads the output?
The cap load drive of the INA317 is 500pF. Anything higher than 500pF will lead to instability. To learn more about amp stability and the effect of a large capacitor at the output of an amp, follow this training video series: https://training.ti.com/ti-precision-labs-op-amps-stability-1?context=1139747-1139745-14685-1138805-13848
Hope that helps.