Max_over_time not showing the correct value in table

Hi,

I’m having a problem (and I assume it is a setup / programming issue on my side) and I hope someone is able to help me.

Grafana 8.02 on a Pi

I’m getting data every 15 sec from a weather station and I want to display the max value from the last 30 days in a table.

In the graph legend the max value is correct (checked in the CSV data).

In the table I have the followoing set up:

I tried out several things, but the max value in the table never matches the one in the graph.
For sure, I have made some stupid beginners mistake, and I hope that not too much people are wondering about it, but thanks a lot for the support!

Regards,

Peppi, from Austria