The last 2 devices in your static list are overlapping your Dynamic IP range.
You should fix that.
Cant see Your Dynamic list from your screen shot.
you need to scroll down on the page.
I fixed it:
Deactivated DHCP on Green and Blue.
Activated it again
Via SSH:
/etc/init.d/dhcp stop
/etc/init.d/dhcp start
/etc/init.d/unbound restart
Now I can see the leases in the backend.