Check out the faucet plate mounted on tub side for a good seal. Water can leak down this plate causing it to look like the valve is leaking.
When you are in the shower it splash's water against the valve and water will run down behind it. Check the tub spout and if you have tile check the chaulked joint where tub and wall meet.
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Check the faucet plate that holds it in place for tight seal. If it only does it when you shower water is probally running down by plate and behind wall. Also check tub overflow for tight seal?
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