On the admin page where the problem exists, if you look in chrome and open the web inspector, and click on console. Are you getting any error messages appear there? https://developer.chrome.com/devtools/docs/console
If so please copy/paste them here so I can take a look.
The next thing to check if you’re all up to date would be plugin conflicts. Do you have a cache plugin or similar on the site? If so clear your cache fully inside the plugin before deactivating. Then deactivate all plugins and refresh/check.