Sometimes, when clicking on the 'Notification' tab of a tracker, the rigth menu is not properly displayed and mask the page content.

Steps to reproduce:
1- Ensure you use the right menu collapsed
2- Click on the 'Trackers' icon on the right menu
3- Click on a tracker
4- Click on the tab 'Notifications'
-> The right menu is not complete and is not collapsed whereas the notification page is displayed in the collapse mode (See attached image)

Sometimes, the display is ok. Another click on 'Notification' can give a different result.
Change of tracker or click several times on 'Notifications' if you don't reproduce first time.