How come train_loss is increasing whereas error_rate and valid_loss are decreasing?

[franva (Winston Fan)]

My folder structure

• train
• birds (7500 images)
• others (7300 images)

I use lr_find() to find my best LR and applied to my training.

1. Why is my train_loss increasing?
2. How come my error_rate is decreasing?
3. What are the reasons which caused this situation?