problem about InstantNeRF training

[cseconds]

Thank you for your great work, recently I want to test the InstantNeRF training code, but I encounter a problem. I loaded the weights of InstantNeRF and trained the model using G-buffer Objaverse data, I use a GPU training to test, but after 100 iterations the rendered results are white. Is this reasonable? :

Below is my training configuration：
learning_rate: 4.0e-04
batch size: 1
GPU : nvidia A100 80G
render_size: 192
input_size: 320