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Please post your solution and mark it as having spolier content.

Do not modify the original array ;-)
Make a new copy then start your work.

I'm also getting failures in random tests and, after some messing around, I got this:

✘ Expected: 56, instead got: '19 [1034,87,2,39,17]'
✘ Expected: 69, instead got: '36 [1006,31,5,38,61]'
✘ Expected: 134, instead got: '107 [1019,73,66,41,68]'
✘ Expected: 70, instead got: '19 [1089,89,13,6,57]'
✘ Expected: 26, instead got: '8 [1087,83,5,21,3]'
✘ Expected: 73, instead got: '52 [1048,87,27,46,25]'

Where you can see that my solution was correct, but the expected values weren't.

Random tests doesn't work
Log
[ 1034, 24, 64, 2, 80 ]
lowest-1 = 2
lowest-2 = 24
✘ Expected: 88, instead got: 26
Log
[ 1070, 67, 47, 1, 81 ]
lowest-1 = 1
lowest-2 = 47
✘ Expected: 114, instead got: 48
Log
[ 1045, 32, 5, 72, 1 ]
lowest-1 = 1
lowest-2 = 5
✘ Expected: 37, instead got: 6
Log
[ 1049, 47, 2, 61, 11 ]
lowest-1 = 2
lowest-2 = 11