Flapper in Toilet Tank

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IRVHYMAN
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Q:

I FLUSH THE TOILET, THE WATER IN THE BOWL SWIRLS AND GOES DOWN, BUT THE FLAPPER IN THE TANK TENDS TO STAY OPEN BECAUSE THE WATER GOING DOWN THE HOLE FROM THE TANK TO THE BOWL BUBBLES UP AND KEEPS IT OPEN. SOMETIMES THE WATER COMES UP THE OVERFLOW TUBE AS WELL.  BUBBLING UP THE FLAPPER HOLE KEEPING IT UP AND PREVENTING THE FLAPPER CLOSING. I REPLACED THE FLOWMASTER VALVE. CAN'T FIGURE OUT WHAT IS CAUSING THE BUBBLES TO COME UP THE DOWN HOLE .