Hotspot issue

Love the plugin and love the display – which is fine on Mac (desktop) and on dell laptop but not on macbook pro (tried both Safari and Chrome browsers. Same issue on each. Hotspots show but have slipped considerably.

This is the link http://www.royalsignalsmuseum.co.uk/interactive-floorplan/ but what you see may vary as I am getting a mix of spot on and out of kilter depending on machine used. The hot spots are also slightly out on my iPhone but not as much as on Mac book Pro(OS X Yosemite 2560 x 1600 display,

Any help appreciated. Many thanks

https://ww.wp.xz.cn/plugins/draw-attention/