Pseudo and EMA pseudo dice are 0.0

[ObedDzik]

I am using nnUNetv2 for a tumor segmentation task with dual channel input, PT and CT. Using the 2d configuration works well and I obtain realistic dice scores on the dataset. However, when I use the 3d_fullres configuration, I obtain 0 on both pseudo and EMA pseudo dice after about 10 epochs. I did not obtain any errors whatsoever in the preprocessing step. I have attached the learning curves. Is there something I am missing that could be causing this behaviour? I would greatly appreciate help on this, thank you.