An error happening, being discovered and corrected through validation (that at least according to some reports is going to be always done before certification of the result: https://mobile.twitter.com/jhalderm/status/13251633006996480... ) seems like the overall system working just fine? Something to fix (why have the early machine result if it's so easily broken), but doesn't seem that different than someone fat-fingering a number while reporting etc.
You either have a machine tallying the votes that works 100% of the time during the election. Otherwise, everyone can reasonably question the results from a machine that works 99% of the time.