I cannot say that understand what is going on there, as I don’t have Librem 14, but you can try following command (if sudo reboot not helping):
sudo fwupdmgr refresh
If above not helping you should try this one:
sudo fwupdmgr --force refresh
Useful read about: https://blog.3mdeb.com/2019/2019-07-11-how-to-safely-and-easily-update-your-firmware/