Hello,

01. Try to upload also your favicon in the way described here https://codex.wordpress.org/Creating_a_Favicon

02. Our theme has no custom styles that directly affect background inputs from this plugin. To check if this problem is caused by our theme, you have to test it with the default theme first like WordPress Default theme and Woocommerce default storefront theme. If the issue still exists then it means the issue is from the plugin not the theme.

Best Regards.