Please follow the below template, it will help us to help you!
If you are Experiencing issues with a Pi-hole install that has non-standard elements (e.g you are using nginx instead of lighttpd, or there is some other aspect of your install that is customised) - please use the Community Help category.
Expected Behaviour:
When i view my Network Overview, i would expect devices that are actively sending queries through pihole would show a near real-time "last query" value on the Network Overview.
Actual Behaviour:
When i view my Network Overview, some of my devices are showing a very old "Last Query" date from 1933 but they are actively sending querying through pihole real-time.