A search on games with a weblink (Lemon in this example) still returns results:
http://hol.abime.net/hol_search.php?N_nb_la=yes
So the marker is still in the database but the game pages no longer display the links.
I am not aware of any reason for this to happen. So I guess RCK will have to take a look, unless he has been doing some updates recently and need to finish these.