mdrnn's train_loss is so calm, anything wrong?

When i try to train mdrnn, terminal shows logs as follows, observiously loss is so "calm" and obnormal. Maybe something is wrong, but i can't get it. Help me, please~

<img width="1774" height="113" alt="Image" src="https://github.com/user-attachments/assets/3d48fc64-a03f-40e7-b65f-a615b2531d62" />