Latency

I have buy Steinberg UR 12, it have a problem with the latency, i don’t really remember when it start but sometimes i hear kind of latency even i turn off the direct monitor. I Still hear it on the left side only from my headphone. When i start to record, the sound from the right side headphone is fine (real time) but the sound on the left headphone kind of delay. I have try to change my headphone but i still have a same problem. How can i solve it ? Is it from the heardware or from computer setting ? Tthanks