Problem with audio in UR22

I connected my steinberg UR22 to the computer with the usb and my speakers to the UR22 and I only hear audio from the left side of the speakers.
I tried to connect headphones to the UR22 and I also hear only from the left headphone.
Is there a problem with the settings of the device or should I change some of the computer preferences?
(I have windows 7)

Thank you very much for helping!!