OmegaB MV6 loss of fluidity near the automatic transmission– Help!!!

Hello I have a question for you again and I think you can also help me before I go to the workshop. I was happy, finally my Omega looks really great again. Got the door edges rusted out and it looks really good again. Today during the 2 ride, I noticed that at once a puddle under the car was at the height of the transmission. I then looked immediately and it comes there with the automatic transmission dripped. There I then above the transmission on the hose that was open at the end. But think that’s normal it’s an overflow or? In any case I would say from the smell and the consistency I would type is cooling liquid. But usually there is no cooling liquid in the gearbox. It comes about there where the smaller lid is at the bottom of the gearbox, but I guess it comes from further up. Do you know what that could be and what you can do there? I’ve been breaking my head all day what that could be d how to get that close again. If I only knew what it is for the time being, but I think you have more experience and you probably already had such a problem. Thanks already now.