I grabbed the python test file: libcmaes/python/ptest_bounds.py

If I modify the lower bounds to:
lbounds = [0]*10

Running I get this output:
best x= [-0.0499810245813009, -0.049984952431464294, -0.05000384317232943, -0.05001758520746221, -0.04997964822517451, -0.049981813653182904, -0.050022418111235284, -0.049990267407082206, -0.04999867943305543, -0.049984492061925366]

Clearly negative values and I try changing the bounds to other positive values and I get a similar problem. Am I doing something wrong or is this a bug?