You are not logged in.
There is the command
top -d 1
which shows among others processes in use, memory in use and also: Number of users.
I was surprised - while being the only user logged in - it showed: 2 users.
Used searx for a bit more command line magic:
w -s
Hmm, there were indeed two: One tty "/usr/bin/openbox --startup /usr/lib/x86_64-linux-gnu/openbox-autostart OPENBOX" and one pts "/bin/bash".
In the end it turned out that the reason for this was geany: If it's open, it looks like this. If it's closed, the second one (pts) disappears. Is it something about creating a pseudo terminal device? And why is it necessary?
If I'm not mistaken, those pts "logins" are also showed by the command last (last USERNAME).
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Geany has an internal terminal. Maybe it's related to that?
You could try deactivating it at Settings -> Common -> Load VTE (not sure if these points are named exactly like that in EN) and check again for the pts "login".
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