Dashboards: Data point missing leading to wrong upward trend in graph

### What happened? When I extend the time range in Grafana, I notice an upward trend in the graph. As image shows, upward trend stop on 10/24 3:00 <img width="1223" height="415" alt="Image" src="https://github.com/user-attachments/assets/24e6a8af-5111-4efd-b61b-b4a021984207" /> However, when I zoom in to a shorter time range, the data values show exactly the same pattern without any increase. 10/24 00:30 - 3:25 trend <img width="1234" height="392" alt="Image" src="https://github.com/user-attachments/assets/270c5cbe-be28-41e2-b14a-774e9284a5a7" /> And data on 10/25 19:00-23:50 The trend are all the same <img width="1654" height="772" alt="Image" src="https://github.com/user-attachments/assets/b511516a-0511-4d8f-8343-683bab99bcd6" /> But why does the first image shows the trend upward? I’d like to understand how the selected time range affects the displayed data. Does Grafana automatically aggregate or average the data (for example, into 5-minute intervals) when showing longer time ranges? ### What did you expect to happen? The trend looks all the same ### Did this work before? no ### How do we reproduce it? 1.NA 2. 3. ### Is the bug inside a dashboard panel? _No response_ ### Environment (with versions)? Grafana: OS: Browser: ### Grafana platform? None ### Datasource(s)? _No response_