Digital BW, The Print

Hello,
 
Epson Artisan 837 b&w printing problem.
 
I am new to the group and wonder if anyone can give me some ideas for trying to figure out why my black and white prints have magenta or purple shadows?  
 
I have tried with selecting the black and white only on the menu and regular.  I use photoshop cs6 and have tried to let Adobe or the printer control the colors with no luck.  The ink levels read ok, with the black reading somewhat low, but it says not empty.   Is there some way to make the printer stop ruining otherwise nice looking prints with funky colored shadows?
 
Thanks,

Curt

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