you are reading the error log wrong

testing for [59,71,9,100,8] expected [ [ 59, 71, 9, 100, 8 ], [ 8, 71, 100 ], [ 71 ] ] to equal [ [ 59, 71, 9, 100, 8 ], [ 8, 71, 100 ], [ 100, 71 ], [ 100 ] ]

you returned [ [ 59, 71, 9, 100, 8 ], [ 8, 71, 100 ], [ 71 ] ], while the answer is (as you calculated) [ [ 59, 71, 9, 100, 8 ], [ 8, 71, 100 ], [ 100, 71 ], [ 100 ] ]

not a kata issue

Same as python