I already found a thread about the same issue, though I could not reply to the post.
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Time: 10th of December, 2016 around 14:00PM UTC+01:00
Frequency: Every day
World name: Odin EU
Character name: Syn Xiah
NPC name: Any of the Beast Tribe NPCs
Monster name: None
Class/Level: Any
Party or solo: Either
In-game time: Always
Area and coordinates: Any
Steps:

1. I went to go do my daily beast tribe quests with the Sahagin. I still had my quests from the day before. I completed them, but afterwards saw that I could not do anything more for the day. I did not think much of it since I believed it counted for the day i completed the quests.

2. Since I do not usually do daily beast tribe quests I first, after some weeks, went back to pick up my daily Vath. I noticed the quests were all marked as red and I could not accept them. I then went to other areas to check if I could accept the quests from any of the other beast tribe NPCs. I could not. I went on and tried to change classes to make sure. All NPCs showed me I had 6 allowances left for the day - also the same number I had weeks back.

3. Same thing happened the day after. I checked my journal to make sure I had no beast tribe quests since I read from other forums I could have missed one, though I did not. I checked the NPCs again, Same number of allowances: 6. I sent a mail and got a reply I should make a post about the issue.