Run "gsettings get org.gnome.desktop.input-sources xkb-options". If you see more than one list item that begins with "grp:", that might be it. Use "gsettings set" to remove all of them except one (or just all of them).
Run "gsettings get org.gnome. desktop. input-sources xkb-options". If you see more than one list item that begins with "grp:", that might be it. Use "gsettings set" to remove all of them except one (or just all of them).