Impossible to read your code. Use

Code (Skript):

1. [CODE=SKRIPT]CODE INSIDE[ /CODE]

 

Code (Skript):

1. on load:
2.     delete {random.item.list::*}
3.     add 2 diamond to {random.item.list::*}
4.     add 2 iron ingot to {random.item.list::*}
5.     add 2 leather to {random.item.list::*}
6.     add 2 tnt to {random.item.list::*}
7.     add 1 flint and steel to {random.item.list::*}
8.     add 1 golden apple to {random.item.list::*}
9.     add 4 cooked beef to {random.item.list::*}
10.     add 32 stone to {random.item.list::*}
11.     add 32 cobblestone to {random.item.list::*}
12.     add 4 cooked porkchop to {random.item.list::*}
13.     add 32 planks to {random.item.list::*}
14.     add 2 apple to {random.item.list::*}
15.     add 1 stone sword to {random.item.list::*}
16.     add 1 stone pickaxe to {random.item.list::*}
17.     add 1 stone axe to {random.item.list::*}
18.     add 1 leather leggings to {random.item.list::*}
19.     add 1 leather boots to {random.item.list::*}
20.     add 1 leather chestplate to {random.item.list::*}
21.     add 1 leather helmet to {random.item.list::*}
22.     add 4 snowball to {random.item.list::*}
23.     add 4 arrow to {random.item.list::*}
24.     add 1 bow to {random.item.list::*}
25.     add 1 iron sword to {random.item.list::*}
26.     add 1 iron pickaxe to {random.item.list::*}
27.     add 1 iron axe to {random.item.list::*}
28.     add 1 iron leggings to {random.item.list::*}
29.     add 1 iron boots to {random.item.list::*}
30.     add 1 iron chestplate to {random.item.list::*}
31.     add 1 iron helmet to {random.item.list::*}
32.     add 1 diamond sword to {random.item.list::*}
33.     add 1 diamond pickaxe to {random.item.list::*}
34.     add 1 diamond axe to {random.item.list::*}
35.     add 1 diamond boots to {random.item.list::*}
36.     add 1 diamond leggings to {random.item.list::*}
37.     add 1 diamond helmet to {random.item.list::*}
38.     add 1 diamond chestplate to {random.item.list::*}
39.     wait 1 tick
40.     execute console command "/chest"
41.     create timer "chestzeit" for 10 seconds
42.    
43. command /chest:
44.     trigger:
45.         loop blocks in radius 1 around {chestloc}:
46.             if loop-block is a chest:
47.                 clear loop-block's inventory
48.                 set {_item} to a random number between 3 and 6
49.                 loop {_item} times:
50.                     set {_randomitem} to random element out of {random.item.list::*}
51.                     add {_randomitem} to the loop-block's inventory
52. command /setloc:
53.     trigger:
54.         set {chestloc} to player's position
55.  
56. on timer complete:
57.     stop timer "chestzeit"
58.     execute console command "/chest"
59.     create timer "chestzeit" for 10 seconds

 

What doesn't work?

If the items just aren't being added to the chest try doing this instead of adding {_randomitem} to the chest's inventory

Code (Skript):

1. set {_slot} to random integer between 0 and 27
2. set slot {_slot} of loop-block's inventory to {_randomitem}

 

So I have edit the code. Sorry