I have a weird problem with this monitor, it seems as though the image won't centre in the middle and keeps either going all the way to the right or all the way to the left, and sometimes centres.

have tried this with both a MacBook and a windows laptop as external display and issues on both, I also get some eye strain when using the monitor and want to make sure I haven't received a defunct monitor.

in the first picture it is showing the gap that I am talking about on the right side

and the second picture below shows that there is no gap on the left hand side, it feels as though the image keeps moving around now and then to re-align