Okay.. here is the bug, the grandmaster from the morag tong asks me if i can bring him the belt of sanguine, i traveled to Pelagiad, killed Hrordis but i think It is not updated, because when I take the belt, I keep marking the objective, I go back to the grandmaster and he still tells me to do the quest, there's any way to fix this?
It is not updated, because when I take the belt, I keep marking the objective, I go back to the grandmaster and he still tells me to do the objective

Thank you for the bug report.
Thank you for the bug report. There are a few known bugs with the Morag Tong Sanguine Items quests, hopefully we'll get them fixed in the near future. The Sanguine Belt quest, also known as "Webspinner: Fleetness quest" has a bug where the quest can start before you finish "A Contact in the Dark Brotherhood". Finishing this quest will hopefully allow you to complete the sanguine belt quest too. Let me know if this does not work -- I probably won't be able to fix this bug before the end of the year, but I will definitely put it on the todo list.
Make sure you have the Morroblivion Unofficial Patch installed to fix other bugs, and be sure to look over the Active Bugs and BugFixes 2017 List.