Thank u:3_coool:Imagine this: Fill up a bowl with water and stir it vigorously with a spoon.....this is like 80/90 in your trans when it's warm.
Now, fill up the same bowl with Jell-O, stir vigorously, the bowl will begin to spin on the counter. This is the 80/90 cold.
Even with the oil warm, it could still happen due to a lack of friction in your gearbox. Just an unintentional viscous coupling.
Don't fret, it's a good thing.