Hi and Welcome to Just Answer,
Ok, let's take a look at this;
You may have a obstruction in your main line drain, you may need to auger out the line to get the flow better, if that doesn't work,
I would check the vent pipe next to make sure that you have proper air flow, if it is obstructed, it will be trying to force out and draw air.
For more info on your vent pipe watch this video
If you need more help Let me know
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