pencial sketch printing as blue instead of grey

[her24gl]

I had an artist make me a drawing in pencil. She scanned it in and created a png file of it in photoshop. I opened it in Gimp and accepted the default conversion.  When it opens, it looks like it should on the screen.  But when i print it out, it prints in shades of blue instead of grey.  When i open it in windows picture manager and print it on the same printer, it prints properly (shades of grey).  Is there something else i need to do to get Gimp to print it appropriately?  My apologies, as I am very new to Gimp.

TIA!