Sounds like possible contamination from moisture. I would recommend flushing this out and replacing immediately. I know the old saying that water and oil do not mix, but I have seen ATF look like you described after cooling water contaminated ATF on a torque converter dynamometer where I previously worked. Keep us posted!
That 'vette at the top of your screen is YELLOW. I suspect what you're calling "yellow" is just well worn fluid that's half-way to brown. Get rid of the stuff, several times, 'cause a drain and refill doesn't get rid of all the bad stuff the first time.