error on validation lower than on training for aspirin dataset

[heliogabale]

Hello
I am using the config /example.yml to train a model on the aspirin dataset.
The error (MAE and RMSE) I am getting on the validation set on energy is 5x-10x lower than the one on the training set (MAE).
The dataset is shuffled and it uses a random split train/validation .
This is true throughout the training ( I am stopping for now at 100 epochs).