Left button on Deathadder Elite sometimes acts as "Back button"?

Basically, when I read I usually mark the words by holding the left click (it's a habbit of mine) I just bought my Deathadder Elite a week ago and it's been acting up with this on random occasions. It happens at least 40 times a day so it's super annoying. Anyone had a similar issue? Please help me fix this. I contacted Support but they did not provide any help. Also - my device doesn't recognize my Deathadder Elite when I checked in the Device Manager, so I can't map anything in my Synapse 3.0. Please help!