Off Center Slider

Hi There, i’m using the StanleyWP Theme and i’m having trouble with fitting the slider to the full container width.
Originally without any changes to the slider settings, the slider is shrunk automatically by the theme (i think).

When I adjust the slider settings by unticking ‘Make this slider responsive.’
And ticking the ‘Enable 100% Full Width’, it reaches the desired size but is now off centre, to the right.

Any ideas what is causing this??
Let me know what you need in terms of code!!

https://ww.wp.xz.cn/plugins/easing-slider/