A pink cast usually means one of the other colours isn’t printing properly. It’s unlikely to be the paper, but if your cyan or yellow channels are blocked then magenta dominates and everything comes out pink. Try running a nozzle check and a head cleaning cycle from the printer’s maintenance menu to see if all six colours are firing. Also make sure the ink tanks are topped up and that you’re using the correct media type in the driver (for matte paper, choose a matte or plain paper profile). If the issue persists after a few cleanings, you might need to flush the lines or contact Epson support, but paper type alone shouldn’t cause a heavy colour shift.