Leaks fluid from seal where torque converter attached to it replaced 3 times

There are a few things > Porosity in torque converter hub weld joint .. Grooved or roughened converter hub where seal rides .. Worn converter hub bushing .. Damaged cavity the seal is pressed into or the surrounding transmission case .. Flex plate (flywheel) warpage which is in turn transferred to torque converter .. Damaged or incorrect seal .. Misdiagnosed - leak source is elsewhere.