Am I 200 meters short???!

Have I beenout of it the last long while?  I run the same route for my 10 km usually each day along a hike bike trail.  I had originally mapped out the route on my bike to figure out the 5 km turn around point.  Upon looking at the Map My Run, Daily Mile etc, I now look at the terrain, and the marker on the trail is not visible so I cant be sure, but it looks like I have been 100 or so meters short on my 5 k turnaround!  I cant zoom in far enough to recognize the house I always pass!  This would be so discouraging for my times I have been killing myself to think I am achieving!  Has this ever happened to anyone??  Maybe Map My run has the distance off?

10 k training

Today's 10 km Time : 41:22I am effectively beating my best of last year in prep for the Oliver 10 km in April.  I am hoping adrenaline and training will get me under 40 minutes, but that is also hoping no injury occurs, which in my tendency in pre-race prep.  I will be massaging, stretching  and making an appointment for some massage.  I am happy with my progress, and I am thinking minus 5 lbs will get me to that under 40 minutes goal.  It will however, be painful and possibly make me puke.