Only getting one thing and one thing only from Kanais Cube

I’ve been trying to upgrade a rare item (a scythe in this case) to legendary and i keep getting the same item over and over again. is there a certain trick to it or what?
What am i doing wrong? T_T

Only thing to keep in mind is if you put a 2 handed scythe there it will come as a 2 handed legendary and similarly if it’s one handed scythe then the legendary is one handed too. Same goes with some other items for example if you are trying to get a belt for barbarian you have to make sure you are not putting a rare belt but a rare mighty belt. The legendary item that you get is always the same type of the rare item that you put. Other than that no it’s just bad luck if you keep getting the same item over and over.