No live data on overview-page

  • Platform information:
    • Hardware: Raspi 3B
    • OS: Raspian
    • Java Runtime Environment: openjdk 11.0.14
    • openHAB version: 3.2

I have a complete new installation of openHAB3. I have added some Bindings (AVM, NTP, Weather,
Pigpio ). Looking at some example-videos i always see live data in every screen
In my installation i can see live data in “Items view” and on the “sitemap” only.
But in all other views i can only see this: " - ".
And i can see that a “toggle-card” in the overview alwasy tries to switch a bit “on”, never “off”.
In the logfile only “command ON” is shown.
Overview:
2022-03-23 11:07:24.321 [INFO ] [openhab.event.ItemCommandEvent ] - Item ‘Pigpio19216816938_OUT_23’ received command ON
2022-03-23 11:07:24.327 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item ‘Pigpio19216816938_OUT_23’ predicted to become ON

Sitemap:
2022-03-23 11:10:11.876 [INFO ] [openhab.event.ItemCommandEvent ] - Item ‘Pigpio19216816938_OUT_23’ received command ON
2022-03-23 11:10:11.888 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item ‘Pigpio19216816938_OUT_23’ predicted to become ON
2022-03-23 11:10:11.913 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item ‘Pigpio19216816938_OUT_23’ changed from OFF to ON
2022-03-23 11:10:12.865 [INFO ] [openhab.event.ItemCommandEvent ] - Item ‘Pigpio19216816938_OUT_23’ received command OFF
2022-03-23 11:10:12.869 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item ‘Pigpio19216816938_OUT_23’ predicted to become OFF
2022-03-23 11:10:12.884 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item ‘Pigpio19216816938_OUT_23’ changed from ON to OFF

On the other side, i have added a widget “kamera klein”. Here i can see a camera-stream but only on
the “overview-page”. Th sitemap says “no video found”.
(there are no errors in the logfile)
Can anyone tell me why, and how i can configure it to see live data ?
Thanks in advance,
BR Hans-Georg

I think i found the problem:
If i call openhab with
https://openhabian:8443
everything works fine.
Maybe someone can tell my why, and how to solve this.
Thanks in advance,
Hans-Georg