R10 Yardages - What is going on?

Got my R10 and took it to the range and the yardages were fine from what I was expecting. 

Me and my brother decided to get a big net and a golf mat to set it up in our garden which would allow us to play after work here in the winter in the UK. Since we have done this, the yardages are just well off… the first time we used it a flushed 7 iron would only got 100 yards and we managed to get it improved but the yardages sometimes are just well off at times at least 10 yards. Sometimes when I even hit my lowest hybrid pure clean it only goes sometimes 140 yards which just makes no sense. At first I just dealt with it but now it’s just getting annoying because there’s no consistency so I’m really just hitting and hoping. 

for the record I have the bet 8-9ft from the ball and the Garmin 6-7ft behind the ball and it’s level with the mat just nothing is improving it. Surely they need to sort this out? 

  • Yup, driver is easy 50 yards short. Woods similar.  Of course reading the forums after I made the purchase I realized that every driving range in my area is not suitable for this device.  Concrete floors and over head fans.  Now i know why the guy who sold it to me was getting rid of it so soon after purchasing it. Useless pos.