the output is perfectly right. you counted the wrong direction ;)

name    => elem. no
part1   => 0
part2   => 1
part3   => 2
part4   => 3
part5   => 4
part6   => 5
part7   => 6
part8   => 7
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splice @array, 5, 1 is translated: get one element from the fifth element on out of the array @array (and replace it with nothing)