You might have just been really unlucky with your Night Lord (given that that have a skill that increase drop rate by 15% if you only kill monster with it, the drop rate however does not apply to marks) and really lucky on your pathfinder, as the first familiar drop usually take on average 1 hour.
You should have farmed a mixed golem familiar for the +20% drop rate before attempting this to make it easier.
Some issue with your data collection.
Should have separated the data after you started to use the big spider familiar on your pathfinder.
Getting combo orbs on your NightLord will inflate the monster kill count (also one of the faster class to generate combo orbs when marks is active), as exp from monster from being overleveled is reduced by 30%, where as the exp from combo orb remain the same.
Need more data than just from 1 trial.
Brief bug summary:
"Complete daily request" should have been written as "Swap daily quest" as the functionality of that option is to swap quests in exchange for 500000 mesos each. Probably got mistranslated during one of the patch.
Always change channel if you used the boss queue or is on the channel that the boss queue put you in.
This bug occurs because too many people are trying to fight Horntail or Zakum on the same channel. (The game at some point (after an unknown amount of people has entered) failed to properly prepare that particular instance of Horntail that is assigned to you)
