Weird render outcomes but with no errors

[hhr346]

I followed all the instructions from the repo, and the procedures all seem fine with no errors. But the render outcomes seem weird.
Below is my process of training and rendering. The training loss is around 0.04.

Then the comparison of gt and render directory:

The nvcc –version is
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2021 NVIDIA Corporation
Built on Fri_Dec_17_18:16:03_PST_2021
Cuda compilation tools, release 11.6, V11.6.55
Build cuda_11.6.r11.6/compiler.30794723_0

torch version is:
torch 1.12.1+cu116
torchaudio 0.12.1
torchvision 0.13.1

Is it normal and did I do anything wrong?