Calculators disagreeing seems much less common than people disagreeing. To me that it is to be expected because people design calculators to answer mathematical questions for them. Humans themselves are only "designed" by natural selection to make more copies of genes.

The earliest calculators go pretty far back, before what we would know call a "computer". A long time ago I scoffed at the notion of a morality calculator. Would it be possible to build something like it without having achieved General AI?