Hackdirt quest - award missing

[Subcomandante Marcos]

Completing the A Shadow Over Hackdirt quest (rescue Dar-Ma from Deep-ones village) gives me thanks from her shop keeping mother and a quest update that says that she increased my skill in Mercantile. But investigating mys skill before and after shows no such award was given. Bug or just bugged for me? Link to quest: https://en.uesp.net/wiki/Oblivion:A_Shadow_Over_Hackdirt