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

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?