ntopng webui misleading in chart representation of underlay data

[MrdUkk]

Environment:

• OS name: Ubuntu
• OS version: 22.04
• Architecture: amd64
• ntopng version/revision: Version: 6.4.250522 [Enterprise/Professional build] GIT rev: 6.4-stable:7c537ad5b8cd57acfdec1c849fa57ee9bc97a029:20250522 Pro rev: r7273 Built on: Ubuntu 22.04.4 LTS

What happened:

the charts is out of correctness. weird and lying

How did you reproduce it?

added nprobe collector mode with 3 devices exporting statistics opened flow exporter chart for single exporter device , set chart type to 'dropped flows' now set timerange last hour. observe maximum, change timerange to 6 hours and observe new maxium lower than first specified. thats annoying.

Debug Information: such incorrect charts seen on any other type of statictics displayed in various places of ntopng webui.