hydraulic oil in the radiator? 2940 JD

I have a 2940 John deere and it has hyd oil in the radiator, the cooler is external and the engine oil is as clean as can be, I just changed it, made sure it was full then drove for chores, then the radiator had about 1/2-1 gal of hyd oil, engine oil is still full, How is this possible.
 

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