Did you do the Drop test on the humi?
This isnt a smart A$$ answer it actually works. Crude, but functional kinda like me lol.
Lift the lid of your humidor about 2~3 inches then drop it. If the seal is "good" you should hear a sorta whoosh sound as the air cushions the fall of the lid. If it just goes smack closed your leakier than well something leaky
