Boring crashes into lower side

Hi Folks. Cant figure this on out. bar crashes into lower part or geometry. I have a file that works and does not behave like this but i cant figure out what the difference is or why this behavior. anyone know why i cant select a way to control where the bar goes? its not consistent from what the roughing is doing or follow the same geometry as the roughing,. Roughing doesnt crash in to the part. Its bigger than 4mb so i cant upload here. any suggestions?