carpet axes with all decreasing data put the axis labels in the wrong place

[alexcjohnson]

See https://codepen.io/alexcjohnson/pen/VExvjr?editors=1010

whereas if I reverse all three arrays we get the correct result:

[etpinard]

Other case: https://codepen.io/etpinard/pen/xNmKZp?editors=1010