Hi,
See this barbarian. She has a 4/5 rage uses before this fight. i'm using it.
I use it.
The monster is dead, let me check the number of rages per day available:
I don't know when was the last rest, and i'm not even sure that when I rested i had more than 1 rage per day available.
Savegame: https://we.tl/t-nUDf3RoTVn
Edit: to be honest, i don't remember this barbarian being exhausted after a rage but it may be normal since i never raged when low level (I forgot she can...) and maybe I already took the "no exhaustion after rage" feat for this barbarian character
Edit 2: when i finally rested, i got 6/6 uses. using it never decrease the number of uses per day.