Why are my colour changes not saving on Fluid?

Anyone know why my colour settings in my themes are not being implemented or changed on my pages? Feel like this has only happened since I've been using Fluid.

Example below of the button colour - it's a pastel pink on the page, but as you can see, in the colour theme it's bright pink - why is it not changing?

Yes it's the right theme before anyone asks - I double checked that!

And yes - the button on the page is a primary button!

Same problem here. You try reporting it to Squarespace Customer Care.