The same thing happened to me, but I clicked on the dead body of the goblin king 2 times (so the movie with the sad music and gobling king scenes showed twice), then when I went to talk to the king Orson it only opened the shop dialogue. I have no way of checking, but I suspect that by clicking 2 times on the ork king body the variable that controls the progress of the story increased two times... If you are using variables to control the story flow, do not use the "increase" option, instead use the "set value" option, that way the value will be kept constant at each "story point" even if the payer does something unexpected.