Unable to save the changes on the custom color theme

Hi, 

I am making a form using the newer type of forms, and there is an error when saving the changes on the color and the style that I prefer. The color and style returns to the default color and does not allow any change. You can also see the error when clicking in the preview of the form, it returns to the default theme and color settings, and does not show any of my desired changes.

Can you please help me with this issue?

Thank you

As I check the form preview, it seems to be displayed normally at my end as shown in the build mode. I have also cleared the form caches of your account. Could you check the form again on a private/incognito or a separate browser to see if that works?

Please get back to us if you need any further assistance. We will be happy to assist you further. 

It works now, Thank you Kiran for your help!