When Fully charged and right clicked to a distance further than allowed or aiming at the sky the staff duplicates the amount into the player's inventory
I'm playing the "All The Mods 10" with the original, unchanged mod list in version 3.0 of the Modpack

Inventory before the test

Right Click aiming to the sky

Inventory right after the right click minus the cost of trying to place the torch

That is correct behavior - you should be able to take out the torches that were consumed - and the sojourner's staff should show number of torches minus what was put into your inventory. is that not the case?

I should've posted the last print i took xD, sorry about that, but no, it actually duplicates the torches
It tries to place a torch with a 128 cost, refunds all the torches in the staff and also keeps them at the same time

Here's a short video I made showing it
Video

Just pushed a fix for this and a new release will be out on CurseForge/Modrinth shortly.