I tried a few more variations of the target function to minimize and I am attaching a more complete notebook. It seems that one can roll to a completely different minimum if either the function or the arguments are not rescaled or if the value at the origin is not subtracted. These different minima ...

I am attaching the input slha file that I used to generate Vevacious.py and VevaciousParameterDependent.py and the ipython notebook with the comparison of the minimization with and without rescaling (had to add .txt extension otherwise it would not let me upload, just remove that). I'll extend it wi...