going to make a guess here as to what the issue is. In the coding there is a line to call out what graphic to use depending on which way an item if facing.
[FlipableAttribute( 0x13db, 0x13e2 )]
This is probably set to 2 different container graphics so they only had to write 1 file to get the two different tyrant chest graphics. Hence the reason we see either small crates or kegs as tyrant chests. It is the same as the chest dropping facing the two different ways.