I have the same issue. I tend to use ignite or other active spells or items but i ant focus them since the camera follows master yi as hes doing his alpha strike, which can get you confused and miss the direction that you wanted to go. Please look into this, I will test in custom games to see weather it only takes place in URF or it also takes place outside of it.
UPDATE: Tested for the bug stated above in a custom normal game (ARAM) and the situation was the same. In another note, when creating a custom URF game you are only given the choices of the champions that are in free rotation, this happened 5 out of 5 times.