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I think a specific function should be created to load the CSS styles in wp-admin.
In your plugin, the function wcusage_custom_admin_styles is called with add_action('admin_head', 'wcusage_custom_admin_styles'); but I think it is appropriate to load the styles only in your options page. What I mean is this:
https://gist.github.com/miniMAC/270e62ebf913f1c97c93d052f5732326
This avoids the problem of your styles affecting the serial interface of WordPress or WooCommerce, see screenshots of the problem.
I’am one of the developers of ACF 😉