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The issue is most probably caused by one of the foreign plugins on your site which interferes the site work.
We recommend you to deactivate these plugins, set up the needed colors and then activate the third-party plugins on site one by one to define which one exactly creates arrays symbols in your color fields in Options.
It looks, there was a compatibity problem with WordPress GDPR plugin from Codecanyon.
Plugin requires Redux framework to be activeted, so I assume this one created conflict.
I had to switch to another GDPR plugin.