Trackpad is moving and zooming in on it's own

I bought a Macbook Pro last year when I was still living in Ireland and it worked fine until recently, when the trackpad started moving erratically, sometimes zooming in on it's own and even sliding to the left by itself, too.

I already cleaned my notebook twice, also tried resetting the NVRAM, but nothing works.

Bluetooth also isn't on, so that's not the issue. The battery seems fine.

Updated to El Capitan last night hoping it might change anything, but it didn't.

Anyone know what might be causing this issue?