When I change the color layout it doesn't save to the preview version or published version of the form

When I change the color layout it doesn't save to either preview or the published form.

The text auto-updates. But the color scheme is stuck on the original one I selected when I created my account and started the form, which is a dark blue.

I'm trying to do the purple and light blue.

I could see the purple color in the form:

Could you please clear your browser cache and see if the issue persists or try in the incognito mode.

https://www.refreshyourcache.com/en/home/

https://support.google.com/chrome/answer/95464?co=GENIE.Platform%3DAndroid&hl=en

Also, you may clone the form and then try changing the color if you are still unable to change the color:

I am unable to replicate any issue with my clone form.

Looking forward to your response.

Thanks.