Trans leaking from bell housing

The only time my transmission leaked, and it leaked from that area, it was overfull. I pulled the pan and found the stick was not the correct. I remarked the full line and never had a leak again
I would be surprised if it’s overfull. After I filled the trans and converter the first time and discovered the leak, I drained the pan and only put 1 quart back in it to start. No leak. as I put another half a quart in it, it seemed fine till I took it for a drive again. Maybe because it was warming up?