Mobile View Issues

When using my mobile the plugin has several issues

-When using 2% (far right display) its about 3/4 of the way to the right
-Icon does not show until you scroll all the way to the bottom
-Once you scroll all the way to the top, the icon disappears and wont show again until you scroll all the way to the bottom

Your help is appreciated,
Thanks

https://ww.wp.xz.cn/plugins/x-scroll-to-top-responsive/