Difference WiFi vs cellular

[Marcy]

Hi forum

Soemthing really strage is happening here, which might be related to the OpenVPN iOS app.
I am currently visiting my family and when I use the iOS app to tunnel into my home network via WiFi I can access my home network only "partially".
Meaning I can ping all devices, I can use also connect e.g. to my NAS using different pre-configured file explorer apps.
What I cannot do is accessing my NAS GUI (or GUI of other home network devices) by using the IP adress in a browser.

This only happens when I use the iOS app on WiFi. When I use the iOS app on cellular everything works fine.
I also have a small travel router here with an OpenVPN client and using this- on WiFi I can also access e.g. GUI of my home NAS.

It is not a big deal for me but I thought I drop a post here to in case anyone has any idea or is interested to follow up.

Cheers!