When I go to get any words of "Marked for Death", it also gives me a duplicate of Drain Vitality, and it will unlock for both if I use a dragon soul to unlock either. Since I didn't want a duplicate, I had to reload from the autosave, and now I can't progress through the Greybeard radiant quests for them to tell me where the word walls are.

Arcwind point is known to be bugged for the misc quests. You will almost always have a pulicate of drain vitality. Its not a big issue on the duplication, you can just ignore it in the list. And you can still get the misc courier quests to continue finding wordwalls inspite of the arcwind point bug.

Yeah, but I don't want the duplicate is the problem I'll be stubborn and wait for them to patch it I guess.

I just went to arcwind point and picked up DV also - now I can't continue the Greybeards quests. Luckily I'm doing courier quests simultaneously.