R. click in the widgets section; manage widgets and then enable keyboard state indicator (kbindicator) Mine is C N S US at present N is blued as my numlock is on. Stable
Bugs at
https://github.com/lxqt/lxqt-panel/issues
Having two instances of kbd is listed as a bug 1323 Jan 2020
As you are in stable, I strongly doubt that you are using Wayland but Xorg. LXQT not ready for Wayland yet, but you are in stable and that would mean a very difficult install of wayland.