hi.
according to pictures below, i configured port 4, 5, 6 to be member of vlan 4 and untagged with sftp+1 with tagged option. but port 4, 5, 6 are member of vlan 80.
this situation is working but it is not what i want.
can anyone explain what i forgot to configure.
the bridge has fastforward = 1. does it relative to the issue?

Bridge -> Ports, open ports in question and set the proper PVID=4 for them.