The below text is a copy from Multigun’s recap of 2.3 update found here:
On player death, there is a chance that a Sigil in the player’s inventory will drop, a chance it will be destroyed all together, or a chance the player keeps it.
The “Fiend Sigil” that Dennis talks in the stream is always destroyed on Death, but it fully protects all other equipped Sigils.
So it is random what happens, you can lose a few or most of them unless you have the fiend sigil then you will lose only that one
