Quests in this game work... well... poorly. In all these cases (except Alexander I think) you missed another "random" action you need to do to finish the quest.
*Unlikely Lovers needs the Harbinger of Death dead and the Tablet of the Swornbreaker recovered.
EDIT: Oh, you've done that? Yeah, then it's likely a bug. I finished the whole questline right there in her house 0_o
*Haven't done the Proving Grounds one.
*You need to visit Eithene in the Graveyard to finish that quest.
*Treated like Cattle you likely needed to dug up the treasure to finish it.
-Yep, have done the optional quest after Unlikely Lovers. In fact I had the tablet all ready in advance because I had heard of that quest. Had killed everything on that map including the boss. Maybe the game couldn't handle me able to give the tablet right away, even though THAT quest had closed successfully when it should have since it's a different side quest.
-I had dug up the treasure and even went back to the 'cow' people and told them I did it. Quest didn't update.
-The Eithne one is probably the only one that I actually didn't finish because I didn't know you had to find her in the graveyard after.
These 'random' actions shouldn't be necessary to finish the quests when even in the previous quest updates before moving chapters I get the 'you did it' update for each quest. This is most apparent for the Proving Grounds one as it did not only update when I won the fight but also updated when I talked to the crow. That should be enough to successfully do the quest. And for me to miss something that I had to do is pretty hard because I'm a completionist and do eeeeevery single thing I can in a map before moving on.
