ADL5304 and GU-339 connect is not same why?

hi

I am testing ADL5304, The PD pin is different in the datasheet and the  demo board UG-339, See the picture. 

Notice the cathode and anode of PD.

See the demo board following picture.

They are different, Please give me some idea which one is right?  or there is other thing in it.

Thanks

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