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What is the model number of the valve you are repairing? I need the valve model not the parts.
If you don't know the valve model then all I can tell you is that most likely you either forgot the o-rings that go in the recess of the pressure balancing part or you used the wrong ones (assuming the new part came with several options). It's the o-rings up against the disk of the valve cap that make the valve tight. I'm assuming you replaced the parts in the same orientation they were originally