Devices

Ive been tracking a individual who's been clicking my google ads for the past year and have figured out who the individual is. The IP matches the person who I think it is along with device, and screen size. The one thing that does not match is the browser. It says Safari 5.0 when the devices I have seen him use is Safari 10. Also, the screen size is a 6 +, 6s +, or the 7+ which non of them would have been running the 5.0. Is this a click bug or is there something I'm missing?