Same Python code, same data, different results on different machines

I had a similar problem and I found this discussion. May be the problem is that MKL(Intel Math Kernel Library) float point operations are non-deterministic by default. So export MKL_CBWR=AUTO may solve the problem.

If your code uses linear algebra, check it. Generally, roundoff errors are not deterministic, and if you have badly conditioned matrices, it can be it.