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Marek and Lothander - Journal Bug
2.5 after providing Lothander the Geas Removal Scroll acquired from Jalantha Mistmyr, he provides you with his half of the antidote and steers you to his partner Marek hiding out at The Blushing Mermaid.
Upon defeating Marek, you acquire his half of the antidote. HOWEVER there is journal update confirming that the quest has been successfully completed.
Later on, you can encounter Lothander again at the Blade and Stars Inn. When you speak with him, he gives you a message saying that it was too bad you couldn't get the Geas Removal Scroll but gives you his half of the antidote anyway and again steers you towards Marek. There is even a journal update.
Looks like something is broken here either with this quest or the journal update.