the one missing fight is a super duper old bug (before i even started playing) and seems that it has a fresh bug report
in fact it has happened on almost every day of GWs in B1 this week to a random guild. seems pretty common. and at least i recall it happening in all past GWs i have been involved in.
(Because Kafka is doing such a great job with bug reports lately, there has been a renewed interest in bug reporting from players 
)