When we simultaneously take two road quests that have the accomplishment of speaking to the same NPC, we only receive the reward for one of the two quests.
On spawning the Travelling Merchant - the Road quest one, click & his page opens to 'Show me your goods' as soon as you click that in his quest window it closes, This has happened on Alentia Map, Olandria, Wintertide.
Can not buy anything, sell junk or repair :(