Python pwlf (piecewise linear functions) gives different results for the same data

Question

This is my data:

x
array([  0,   7,  14,  21,  28,  35,  42,  49,  56,  63,  70,  77,  84,
        91,  98, 105, 112, 119, 126, 133, 140, 147, 154, 161, 168,