God damn it!
Tried to use scipy's UniveriateSpline on some (x,y) coordinates that I have and it throws errors because I have multiple x values with different y value. UniveriateSpline expects all x values to be incresasing. Problem is I want to use these values, otherwise the result might be different than expected. B-Splines shouldn't be dependent on this condition or have I missed something in my studies? Documentation doesn't tell me anything.🙄