I was looking at ZRH-DXB Nov 2 with LX in F

KVS showed me 2 seats FS+ with Miles and More search
When I logged in with my MM Nr. and Pin on the website they only gave me economy.
I tried again at the exact same time and KVS gave me seats, MM not

This makes no sense, I attached a picture. I showed it to a friend, he also cant explain in