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Failure to install an anti-smoke partition. If the range hood is relatively close to the outside, the smoke exhaust outlet can be played directly to the outside.
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Fake a smoke barrier at the top flue location to prevent odors from the flue from retrograde to your home.
This is the result of the flue of the building are shared, check whether there is a blockage at the outlet of the main flue, and install a better quality oil smoke check valve.
Of course, you can also smell the barbecue outside .........The aroma is ......
It should be the reason for the flue string, turn on the range hood and smoke for a while, it will be better.
Your range hood pipe and flue do not have a check valve. Add a drain to your dish drain or replace it with a drain.
If it is a common smoke exhaust pipe, you can add a check valve to the flue of your home.