The torque convertor doesn't fill directly, the car must be run. The trans does have a vent at the top, this is probably where the fluid came out. It will be OK.
As to checking the stick. Somehow after pouring in fluid, the fluid must cling to the sides. It seems that fluid always runs way up one side of the stick. CHECK BOTH sides and use the lower one. It will be right.
Bosch Master, ASE Master, L1
33 years MB technician