Charges are deducted when you load a product into the room, or when someone else loads the product by joining the room. The deduction logic has a cool down to prevent it from being unfair or abused by bad actors. So you don't have to worry about loosing charges if your products are loaded often within a short time frame.
Charges are also deducted by our server periodically as a security and monetization method but for obvious reasons I can't go into more details. I will say though that for a regular user, it would take over a year for the server to deduct all your charges this way so it's not something you need to be concerned about. It mostly affects resellers.
@Auspicious K
Off topic: I moved this thread to the help & Support section.
EDIT:
I just remembered we were doing some work on the part of our server that handled the periodic charge deduction and had to test it frequently, so this means charges were drained a lot faster than they would normally. If
@Don Von Alpha Dom
is okay with it, I can modify the charges on your products to give you some back.