AP6 / Sophos central : VLANs shift when disable SSIDs

So this issue is happening on MR5 as well? 
Could you look a support case for this as well? 

Yes it is on MR5 (v1.5.2167)

How can I open a support case for that ? 

I'm new on sophos central product ;-)

Salut Vincent,

I would expect that only one of the VLANs can be untagged, all others to the same port (=physical device) have to be tagged.

So if you turn of an untagged VLAN on a certain port or device, this will certainly change the behaviour of the other untagged VLANs.

Or am I wrong here?

Salut Vincent,

I would expect that only one of the VLANs can be untagged, all others to the same port (=physical device) have to be tagged.

So if you turn of an untagged VLAN on a certain port or device, this will certainly change the behaviour of the other untagged VLANs.

Or am I wrong here?

All my VLANs are tagged : 

I don't know why they are displayed as untagged in the previous screenshot ...