How much "over full"?
(Realize that the fluid level will be slightly higher when the trans and fluid is hot, and lower after when the vehicle has not been running and cold).
If it is only 1/4" (~10mm) overfull, that could account for just normal fluid temperature expansion. Anything greater than that may indicate the following problem.
That said, if the fluid level is significantly higher than normal, there is only one place that can leak "fluid" into the transmission. That would be the rare case where there is a hole in the transmission cooling line which usually connects into the radiator for the engine coolant to cool the transmission fluid passing thru the trans cooling line.
If a hole/crack developed in the trans cooling line inside that location, antifreeze/coolant could leak into the trans line.
Is the trans fluid on the trans dipstick normal colored, or does it appear to be milky with water/coolant intrusion?
2 quarts over for the first time 1 quart over for the second time and no there is no water or anything in the transmission fluid
If it's known the trans was at the "full line" (measured when hot) before the 1st detected overfill situation, that's puzzling and a concern. The 1 quart rise is "iffy" since that is borderline between normal temp expansion and levelness. This problem is reminiscent of when I had a vehcle run off the road into a ditch. I began the trip with 1/4 tank of gas. After pulling out of the ditch, 1 mile down the road I saw I had 3/4 tank of gas. I found the bottom of the gas tank had been severely dented, thus making for less volume and higher gas level. Rare case, but I assume your trans pan is undamaged.
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