Different results in training vs inference

I am experimenting with training different models using different configs. Right now I am using Reflow from v2. But this problem occur in every config/models that I training with. I noticed that the inference audio from my model has worse quality than validation file from training. Why is that? What can I do to achive quality from validation data? input: https://drive.google.com/file/d/1pMjKUtAgZwDqWL8A3YlaWV4B7I1SECYu/view?usp=sharing val: https://drive.google.com/file/d/1Byz-Zeg0kCm75hzmRxiXlwHA5MZp3R2O/view?usp=sharing infer: https://drive.google.com/file/d/1hh4dwiodXsESe_Rv7S49nMGEcl3pZ7lc/view?usp=sharing