Test embeddings change in VoxCeleb recipe

Hello to everyone and thank you for this great software. I am using the Voxceleb recipe, in particular I am running the speaker_verification_plda.py file using voxceleb1. I run it without problems using the pretrained model but if I re-run the file, and delete the stat_test.pkl, it changes. I did not change the train embeddings so the file loads them from previous run. Since I didn’t change anything else, I expected the stat_test to be the same as in the first run. Any idea of what can be happening?

Many thanks!