The warnings you show are for source maps, those only get loaded when dev tools is opened and do not impact normal use. It's common to generate source maps for

The warnings you show are for source maps, those only get loaded when dev tools is opened and do not impact normal use. It's common to generate source maps for error reporting and development/testing environments, but not deploy them in production to keep the un-minified source private. If the UI is garbage or not depends on your definition, but that screenshot doesn't show anything wrong.