Also, I am seeing NPC quests on my lvl 56 Wizard that are old quests. Ones that i have done in lower level areas.

I never had to empty my quest log. Looks like 30 quests is the max now.

always been in game 

Just now, DoctorJekkyl said:

always been in game 

Never had the message...ever.

4 hours ago, Uberkull said:

Never had the message...ever.

Cool, I've had it happen since launch week.  

42 minutes ago, DoctorJekkyl said:

Cool, I've had it happen since launch week.  

I may have noticed something. Did you run multiple alts? Questing each?

I notice this game keeps quests that are from my high level character on my low level character’s quest log.

How does that make sense? My level 10 can’t got kill 100 mobs at Helms.

51 minutes ago, Uberkull said:

I may have noticed something. Did you run multiple alts? Questing each?

I notice this game keeps quests that are from my high level character on my low level character’s quest log.

How does that make sense? My level 10 can’t got kill 100 mobs at Helms.

Yes I have 4 level 56 characters 

7 hours ago, Uberkull said:

I may have noticed something. Did you run multiple alts? Questing each?

I notice this game keeps quests that are from my high level character on my low level character’s quest log.

How does that make sense? My level 10 can’t got kill 100 mobs at Helms.

They are daily missions you only get to do once per day. Across your account. That's why they show up on your alts. 

And yes, the limit has always been there. Quite frequently get the message when doing Trade quests.