I have been fighting with the same boss for about 3 hours, and something weird happens.
Sometimes, when I respawn after dying, I have all my blood vials with me, even though I used them during the fight, but other times, they are gone.
For instance, I entered the boss fight with 20 vials, and the 6 first times I was killed, I was respawned again with 20 vials, but then later on I start losing them permanently.
What is going on? Is there a way to fix this?