Sometimes I lose blood vials and sometimes I don't

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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?
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Do blood Vials replenish?
Blood Vials are automatically replenished (taken from storage) after dying or returning to the Hunter's Dream.How do blood Vials Respawn?
When you die, your blood vials automatically get filled up back to 20 with the remaining ones in your storage. If those are all used up, you need to pick up new ones by defeating enemies, finding them in the environment, or buying them from the merchant in the Hunter's Dream.Do blood Vials automatically go to storage?
Each item's storage capacity is 99, but Blood Vials, Quicksilver Bullets, and materials have 600 max storage capacity. Excess items in the players inventory will be automatically placed in the Storage when the player picks up an item.How do you make blood Vials heal more?
NotesAndrew Belle - In my veins lyrics.
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