Sounds like this might be related to bug 1743736. Can you please run this command to send us more information about the system?
apport-collect 1809826 ** Tags added: cosmic ** Tags added: multimonitor ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1809826 Title: Gnome Activites view on multiple desktops wrong applications To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1809826/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs