If your pie is looking a little runny and has a lot of liquid in the filling, chances are that it was not fully cooked or too much liquid was added when making the filling. Make sure you are following the recipe and all of the quantities are correct before baking. Also, do not take the pie out of the oven if it still looks wet and is sinking. Wait until a toothpick comes out clean and holds its shape when you jiggle it a bit.