What's the weather conditions?
The slightest breeze will take that light line off course.
What kind of fly are you casting?
With a #14 foam fly I often have a cast that ends up with the leader at almost a 90º angle (looks like the letter L) when the line lands on the water. I credit that condition to a vagrant puff of wind I often don't even feel where I'm standing. The line is heavy enough to land straight, but the wind catches the fly as the loop rolls over.
I use a 7' 3wt and have never actually measured casting distance, but I can easily get into the running line on a wf line, so I'm guessing it's over 40'.