If you talk about Python tests, the test with that input, expects -1. The log appear above the test result, maybe you're confusing the log of one test and the error message of another.

You're welcome. Putting both strings lined up makes the difference more visible.

expected:<2:eeeee/2:yy/[=:hh/=:]rr> 
but was: <2:eeeee/2:yy/[:=hh/:=]rr>
                        ^^   ^^

There

I'm seeing the same thing

Sub Arrays            SubSum    SubProduct         |q|
[23, 2, -8, 5]         22         -1840         83.636363
[1, 2, -8, 5]           0           -80          No value
[1, 23, -8, 5]         21          -920         43.809524
[1, 23, 2, 5]          31           230          7.419355  <--- selected array
[1, 23, 2, -8]         18           368         20.444444
                                   ^
                                   |
                                   There is missing minus sign as 1 * 23 * 2 * -8 = -368