Steps to reproduce:

1. Open "Zabbix server health" dashboard
2. Click on the first graph with the right mouse button
3. Choose something from the open computer window (e.g. inspect element)
4. Move mouse cursor to the next graph
5. Click on the second graph with the right mouse button
6. Choose inspect element
7. continue with next graph

Result:
Each graph widget has a selection-box
Expected:
Selection-box doesn't appear