Those 3 coils are inductors, not transformers.
If there is excessive high frequency noise/signal passing to the resistors, it's likely through the larger inductors. The smaller one just cleans up what little noise is left after passing through the larger inductors.
If there is excessive high frequency noise/signal passing to the resistors, it's likely through the larger inductors. The smaller one just cleans up what little noise is left after passing through the larger inductors.