Issue with Chromium Kiosk mode?

[KivasFajo77]

Hi,
I´m using the mini-graph-card in several dashboards in my Home Assistant (Core 2025.10.1). Working fine.
But on my "kiosk" (Raspberry PI 4 with Chromium and Touchdisplay, Chromium started in Kiosk-mode) all mini-graph-cards are not loading their graphs - I only see the spinner.
If I open a normal Chromium page and navigate to any of my dashboards all graph cards are loading fine.
Any ideas?
Thanks
Sebastian