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Spitting toilet, new installation

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Angus28401

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Built new bathroom on second floor, but the toilet spits back occasionally when flushed.
I think this is a venting issue. Attached is a diagram.
Can anyone see any problems with the configuration?

Thanks
 

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Pipes look undersized. Is stack open to the air or just an AAV?
Or could it be bouncing off underfloor bend? Are you sure WC branch falls to the stack?
 

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