Slider Interaction Hover States Not Working

Hi all, I am trying to replicate James Ruffels cool slider interaction with a 3d model but not all the hover states are working properly (story file attached) only the first and last couple are OK.  Noticed that the original is not working properly either in any browser:

https://community.articulate.com/e-learning-examples/storyline-2-slider-controlled-exploration

Hoping someone can shed some light on this please - your help would be much appreciated!

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