Capcom has released a new update for Monster Hunter: World for PS4 and Xbox One, mainly addressing bugs.
One of the fixes is the Kulve Taroth Siege quest line:
“Fixed a bug where the Kulve Taroth Siege quest line would not progress correctly under certain conditions (specifically: if you speak to the Admiral out in the field when participating in another player’s instance of the “A Wound and a Thirst” or similar quests, after having collected Kulve Taroth traces but BEFORE having spoken to him separately in Astera). Players who have encountered this bug already can return to Astera and speak with the Admiral, triggering the council scene, after which the Kulve Taroth Siege will become available.”
The update also focused on a problem with the Wyvern Ignition Sword:
“Fixed a bug where the great sword Wyvern Ignition “Impact” saw its fire elemental attack value unintentionally reduced to 240. The value has been reset to 510. The armor skill “Free Element/Ammo Up” is still a requirement for unlocking the fire elemental attack of this weapon.”
If you want to see the full patch notes, check the Monster Hunter: World official blog.