XP Elixir Glitch

[Scry]

So i purchased an xp elixir for faster leveling.
It says: grants the user with a 50% xp bonus for 30 minutes.


I opened it when we began the run in wt4.
11 minutes later:


I don't know about the other elixirs but the xp elixir lasts just 15 minutes instead of 30 minutes.