The fluid drains out of the torque converter into the pan where it reaches a level that has an orifice with a seal, a very old seal, one that seals better when the car is used regularly. Plus transmission fluid is very thin - it creates a puddle that looks like more fluid than it really is. But you nevertheless have a nice leak going there. It's more likely one that leaks when the car sits than when the car is driven. But keep an eye on the fluid level. BTW, isn't this a 126 fluid leak?