Most likely, as most have said, no plumbing proper venting system. Also, had similar issue at my house and come to find out they never (another cheap standard) a toilet flange between the toilet and the submerged drain pipe. All they did was put tons of caulk around the base of the toilet. I guess thinking the water would just stay totally under the non sealed toilet. I would take the toilet off of the floor and look under it first.
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