This is a glitch that WifS is aware of (at least in ticket responses). Currently, inside the park home runs are actually just a subset of regular HR's. So, what happens is that the game engine decides if a player hits a HR first (based on Power and other factors) then determines what this HR will "look" like, ie HR over the left field fence, deep shot to left, inside the park...etc. Obviously this is backwards and inside the park HR's should be their own event on the same level as a single, double, triple and regular HR. I was told that they would be addressing this in a future update, I just haven't heard when.