You can probably place a CSS z-index on the selector for the cookie notice. Since these are third-party plugins, check with the developer for support or use your inspector tools to identify what CSS class or ID to target that wraps the full cookie notice.
It appears that one of WP Engine’s mu-plugins is being run on an environment that is not WP Engine? If that’s true, then removing the mu-plugin fully (and other WPE plugins) from your environment is the solution.
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Autocomplete search field that is feed by a taxonomy from custom post type?
To find out which plugins don’t have their required dependencies installed and activated, load the plugins page in the WordPress admin interface, and look for the plugin that has this message next to it (use ctrl–f): This plugin is active but may not function correctly because required plugins are missing or inactive. You can see … Read more