different Data in evaluate.py and separate.py

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I want to separate a mix sound with separate.py, but the separated sounds are noisy.
The mixture was female-male mix and I also test it in evaluate.py, the result was ~14 dB improvement in SDRi.
I test this mix file in separate.py, but when I listen to separated files, I find that they are separated female and male sound but they both were noisy.
I don't know what is the reason of noise.

Is this because of using different EvalDataLoader and DataLoader in separate.py and evaluate.py?

Thanks for your helpful repo.