I logged in on webEscargot on a public computer with incognito mode, now that I’m using Messenger from my laptop, it appears that I’m logged in two locations (despite it has been like 6 hours since I closed that incognito tab). I’ve tried clicking the button for signing out from that location, but it simply doesn’t work.
I’m using WLM 2009 on Windows 10 22H2.
Probably just a server bug. Out of curiosity, have you tried signing in from the web again, just to see what happens? I wonder if you would get another location added, or if the prior session might get discarded.
In incognito mode every navigation data is deleted, so you don’t actually have to worry. 
Solution:Sign out from webEscargot using a web browser you logged in.
I hope it works 