Seapost to Seapost Quests

Has anyone found any rhyme or reason as to which Seapost to Seapost Quest you get?
I only need to do the one to Spoils of Plenty, but everytime I start the quest it seems to send me to start at Three Paces East of the The Wild Treasures Store, which when I do them always seem to send me into the Roar.
Any Tips?