Steps to reproduce:

1. For example you need to configure 2 hosts with template "Template OS Linux by Zabbix agent". This hosts will have the "Network Interfaces" host screens.
2. Open the page "Monitoring - Hosts".
3. Click on "Screens" link of the first host. The host screen "Network Interfaces" of the first host will be opened.
4. Now click on graph "Network traffic". The graphs page "Network traffic" of the first host will be opened.
5. Go to the page "Monitoring - Hosts" again.
6. Click on "Screens" link of the second host. The host screen "Network Interfaces" of the second host will be opened.
7. Now click on the graph "Network traffic". You will see the graphs page with "No data found" message (see the screenshot)!
8. To workaround this bug you need to go to "Monitoring - Hosts" page again and click the "Graphs" link of the second host. After that the graph page "Network Interfaces" of the second host will be opened correctly.

Result:
See screenshot...