You logged-in to the admin dashboard and it’s all looking unmanaged and displaying without CSS. Yeah, This happens not so often but If this is the first time then it could make you worried. Just the check the image below, does it look familiar to your problem? If yes, then don’t worry, Continue the thread for the solution.

There are two ways to solve this problem:

1. Through Firewall and Proxy
2. By Upgrading the WP-Plugins

Solution 1:  
Sometimes Proxy or any  Firewall tool blocks CSS to load files and results to a not managed dashboard.

• Check if your Internet connection is behind a proxy connection or firewall.
• Clear the Cache or cookies.
• Refresh the Page

Solution 2: 

If you are using any type of wordpress plugins for any particular action then prefer to upgrade it asap, if it’s not possible to do so then deactivate it.