Disconnected while connecting to another instance

Hi,
My config :
3 Rasberry pi with latests release of grafana
Raspi are :
Linux 5.10.103-v8+ #1529 SMP PREEMPT Tue Mar 8 12:26:46 GMT 2022 aarch64 GNU/Linux
Grafana is Version 11.3.0 (commit: d9455ff7db73b694db7d412e49a68bec767f2b5a, branch: HEAD)
I have dashboards on each instances
Issue :
From W11 when I connect to dashboard of Raspi 1, I 'm disconnected from dashboards of Raspi 2 and 3. If I connect again to dashboard of Raspi2 I’m disconnected from Raspi1…
No disconnction if I stay on dashboard of Raspi1
I use admin user
Any idea ?
BR
Please Help