Why do some tests need the output to be of length 4 in the JS-Kata?

This should be stated in the kata description or better the tests should be adapted

Not sure what the assertion logic is doing when I submit my solution for Kotlin. My last print statement before i return the DoubleArray is:
Result: [1.2219787059623188, 7.958071682121853, 10.172098571448887, 19.35214895953306, 37.4823192131038, 67.00656674408575, 123.8410349167226, 228.32992087391216, 419.17752253472054, 771.3484783253552, 1418.855921733988, 2609.381922594064, 4799.5863226534075, 8827.82416698146, 16236.792412228931]
then I get an error:
It should work with random inputs too: arrays first differed at element [0]; expected:<1.2219787059623188> but was:<2609.381922594064>
But as seen from the println, the first element is 1.2219787059623188 and only the twelfth element is 2609.381922594064