NPC loses items

When fighting the Bound in the catacomb in Sylvan´s Cradle, I have noticed, that things go lost from my companion´s inventory. I had killed the Eoten (tree octopus) before entering, and had given 8 Eoten wood bundles to my companion. When I looked about 10 minutes later to check the companion´s inventory, these wood bundles were gone. It is not the first time I notice, and this should really not happen.