Comment 17 for bug 951123

Thanks Chascon, well that's an hidden option so no wonder it's untested and has issues. You speak about touch devices but for those GTK 3.4 has "smooth scrolling" which should work correctly with the correct direction, I tested in nautilus and it does work as it should.

bug #949465 was about scrolling not working at all on 32 bits arch, it's a different issue from yours, what you describe seems to be a gtk bug, ideally somebody would report it upstream:

https://bugzilla.gnome.org/enter_bug.cgi?product=gtk%2B