I just brought new GL552VW-CN174Dif i press z and x then c v b n m , . / not working.if i press arrow up and z then x s w 2 not working.is it a keyboard ghosting problem? Or how can i solve this?

This thread should post in GL series i'm so sorry very much.===================================I just brought new GL552VW-CN174Dif i press z and x then c v b n m , . / not working.if i press arrow up and z then x s w 2 not working.is it a keyboard gh...