My explorer was exploring the wasteland for 2d 12h, got a bunch of stuff, even required me to build additional storages when he came back, but after I collected all the stuff from him, my storage was only 36/70 full, some stuff, like sniper rifle and 6 lab coats, which he was carrying in his inventory, were not there! Considering that before building up additional storages I had 46 vacant slots for items, I suggest he was carrying more than 46 items, but only 32 items were added! Why could that happen? What should I do to prevent this bug in the future?

UPD: I was NOT clicking on the items in explorer's inventory when he came back, so I didn't accidentally sell them