Here is my config for a kit that I want to be called "wizard" everything is working apart from the potions, they are just giving me stacks of water bottles. Any reason for this? Thanks in advance.

wizard:
active-in: all
commands:
- potion speed 36000
- potion fireresistance 24000
items:
helmet: gold
chestplate: gold
leggings: gold
boots: gold
'0': 280 16:5 19:2
'1': '373:16428'
'2': '373:16388'
'3': '373:16392'
'4': '373:16394'
'5': '282'
'6': '282'
'7': '282'
'8': '282'
'9': '0'
'10': '373:16428'
'11': '373:16388'
'12': '373:16392'
'13': '373:16394'
'14': '0'
'15': '0'
'16': '0'
'17': '262'
'18': '0'
'19': '373:16428'
'20': '373:16388'
'21': '373:16392'
'22': '373:16394'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '373:16428'
'29': '373:16388'
'30': '373:16392'
'31': '373:16394'
'32': '0'
'33': '0'
'34': '0'
'35': '0'
names:
'0': '&cStick of Wonder'

Firstly, thanks for using GitHub 😃

I'm just going to check the code since I can't remember how to do this off the top of my head. I've answered this below:

Thanks, will check back in a minute.

Right, the format is:
itemID:amount:durability Here, you're specifying 16394 glass bottles. Unfortunately the limit is 64 and you've probably upset Minecraft a bit by supplying such a large number 😆

Try this:
373:1:16428

I'll re-open the ticket if you have any more issues.

Thanks a bunch as usual, worked!