Terminal shows that my user is only a member of its group, but it is not true - how to fix?

I went to strange situation on my laptop (running Ubuntu 16.04.5 LTS).

All terminals show that my sudo-able user is only a member of its group:

$ whoami 
norbert
$ groups 
norbert
$ id
uid=1000(norbert) gid=1000(norbert) groups=1000(norbert)

$ grep norbert /etc/passwd
norbert:x:1000:1000:Norbert,,,:/home/norbert:/bin/bash

but it is not true as my user is listed in /etc/groups:

$ grep norbert /etc/group
adm:x:4:norbert,syslog
disk:x:6:norbert
lp:x:7:norbert
dialout:x:20:norbert
cdrom:x:24:norbert
www-data:x:33:norbert
plugdev:x:46:norbert
fuse:x:104:norbert,tester
lpadmin:x:105:norbert
admin:x:119:norbert
norbert:x:1000:
sambashare:x:122:norbert
vboxusers:x:124:norbert
debian-tor:x:129:norbert,tester
local:x:1001:norbert
libvirtd:x:138:norbert
wireshark:x:126:norbert

As the result I can't use Arduino IDE and Wireshark.

If I login to this system from SSH - I can see all groups:

$ groups
norbert adm disk lp dialout cdrom www-data plugdev fuse lpadmin admin sambashare vboxusers wireshark debian-tor libvirtd local

Why this happened? What should I do to debug and fix this behavior?

This problem was linked with my other question about PAM warnings in /var/log/auth.log.

The problem was caused by manually installed PAM KWallet modules. I have installed both (libpam-kwallet4 and libpam-kwallet5), but they can't be installed in the same time as described in the bug 1781418 on launchpad.

I fixed my problem by removing two PAM modules:

sudo apt-get purge libpam-kwallet4 libpam-kwallet5

and then rebooted.