Weird smell from humidor

[Lshapecutter]

I bought new humidor a week ago from Holts. It came with four boveda 84% for seasoning. As the instruction, I've put these four bovedas on humidor for seasoning.

Today, I've checked my humidor and it has weird smell like rotten milk. I want to figure out what is the problem. It doesn't have a odor issue when I've received. Might be the boveda issue? I've already made the replacement since the first one came with the broken bottom seal. I don't want to waste anymore time for seasoning and replacement.