I believe you have a venting problem -- most of the time the stack vents pressure
To outside -- when water goes down one toilet it forces air out of the line and in your
Case it takes the path of lease resistance -- bubbling out in other toilet because of
A plugged vent... Birds build nests in vents and gutter downspouts -- need a
Properly cover... Best way is to snake drain is down the vent pipe to clear it
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