Are you getting a message that you can't take any more quests, or do the huts just fail to trigger?

i also get the level 3 quests to completely disappear after i complete one or two, when there were 20-30 visible on my map section

and failure to trigger on the levels 1-2 quests. i've noticed that if it is a duplicate of a current quest, it won't trigger until you complete the current one.

I think that part of it is that the level 3+ quests are non-repeatable . So a lot of those quest locations are actually trying to give out the same handful of quests, but once you get it from one of htem the rest vanish.

On the other hand, the level 2 potion fetch quest is repeatable so those locations stick around and don't all disappear at once.