the browser has a proxy server configuration, but for the Nexus host, you need to bypass using this proxy server by adding the Nexus host to your "bypassed host" settings.
You haven't configured your proxy server in your browser settings properly.
the browser uses a proxy server to access the Nexus host.
You need to work with your IT department to prevent manipulating requests to/from Nexus.
the organization filters Nexus requests through a proxy server or firewall software configured outside of the browser software, and this firewall software is serving stale or manipulated content.
Clear the browser cache and restart the browser.
the browser is serving files from it's internal cache.
The most common reasons the Nexus UI interface may appear broken are: