Problem with custom items in loot tables

[Dymerius]

In a nutshell, here is the problem:

A certain NPC type is supposed to drop several non-custom items and several custom-made items.

I start the server, enter the zone, kill the NPC, and the NPC drops 0 custom items, but it drops regular(non-custom) items like normal.

If I repop the zone, the custom items reappear in the NPCs' loot tables. In certain cases, the custom items are supposed to drop 100% of the time, so it is not an issue with the probability of an item dropping being too low. And, to reiterate, this is only an issue with items that I have personally put into the items table.

I have many scenarios in-game where an NPC is supposed to drop "normal" loot as well as custom loot and, in most of these cases, I do not have this problem. I've only identified the problem in 6 or so zones. The only thing they have in common (as far as I can tell...) is that the NPCs are higher level (50+).

I'd even be happy with a quick fix - if I could just have each zone automatically repop whenever it is launched :p

If anyone has any information about this, I'd love to hear it.

Thanks in advance,