Hey
A friend just had the same problem, and it seems that 'talkback mode' had been activated in the accessibility options. You should be able to scroll using two fingers instead of one. If you can, go to settings -> accessibility -> talkback and turn it off. Hopefully that fixes your problem
the problem is happened due to in in Setting < Ease of access < Narrator < ON...
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Worked like a charm... Thanx
P.S. Worked on LG G3... (same steps!!)
Did anyone tell you the solution? i have a problem in my cellphone same as yours