Voices are either too squeaky or too deep in the output

I trained a model and with the output, some parts of it sound squeaky and other parts sound deeper than usual. python main.py -i input.wav -m exp/reflowvae-wavenet-attention/model_3400.pt -o output.wav -k 0 -f 0 -tid 1 -step 50 Above is the command I'm using. I'm confused as to why it's doing this.