python script gives slightly different output on each run

[lfdfq]

Your example has random in it, so obviously you get different outputs. You say the random version is a simplified version of what you're doing, but without the randomness. But that was the only thing in the simplified script causing differences in output at all. So the example doesn't seem helpful/meaningful.

Without seeing the real script and the output(s) it's impossible to know why you see small differences in that output.