Voting machine votes wrong

Why voting machines anyway? WTF is wrong with a simple ballot paper? If this US election is going to be tight, then why hasn't this been sorted out? Apparently it was a calibration problem. Why were the machines not calibrated properly in an election where $2billion was spent?

I initially selected Obama but Romney was highlighted. I assumed it was being picky so I deselected Romney and tried Obama again, this time more carefully, and still got Romney. Being a software developer, I immediately went into troubleshoot mode. I first thought the calibration was off and tried selecting Jill Stein to actually highlight Obama. Nope. Jill Stein was selected just fine. Next I deselected her and started at the top of Romney's name and started tapping very closely together to find the 'active areas'. From the top of Romney's button down to the bottom of the black checkbox beside Obama's name was all active for Romney. From the bottom of that same checkbox to the bottom of the Obama button (basically a small white sliver) is what let me choose Obama. Stein's button was fine. All other buttons worked fine.more

BTW Australia doesn't have voting machines. You mark the box, fold up the ballot paper and put it in the ballot box. Counting is manual of course, but the results are usually known within hours. Works better than this BS.