Losing items in game

When taking things out of a chest and putting them in my inventory they are going missing. I demolished a chest and the lost half the amount of iron ore that I took into my inventory I also took 6x64 torches out of a chest but then found I had only 3x64 in my inventor. 8 think that the game is allowing me to put anything I want into my inventory without getting full and I lose what ever goes over the limit.