Buttons & Button Sets - Disabled state previewing/publishing both Disabled and Normal as Initial state??

I'm re-engineering an old storyline file but for simplicity have started a new doc to ask for help regarding Disabled state for Buttons and Objects converted to Buttons using Button Sets.

Each of the object in the attached only have three unique states.

In design mode they show the initial (disabled) state properly but when you preview or publish they show a combination of the disabled and the text on the normal states.

These are completely new inserted object, not copies from the old storyline.

Is this a bug or something I haven't picked up on?

Storyline 360 fully updated today.

Thanks in advance for any ideas and testing of my file