I don't know if this is a Shop issue or an issue with the Give plugin. I have this command configured in the Shop UI config:

 

"MassSupplyDrop": {
    "DisplayName": "Mass Supply Drop",
    "Image": "https://i.ibb.co/QJqV2MM/supplydrop.png",
    "Message": "You've purchased a supply drop for everyone on the server!",
    "Command": "giveall supply.signal 1",
"Command": "say {playername} just bought everyone a supply drop!",
    "BuyPrice": 7500,
    "Currency": "eco",
    "ShowDisplayName": true
  },

 

This gives a supply drop to everyone EXCEPT for the person buying it. If I issue the command in the console, it gives a supply drop to everyone including the the person buying it, as it's supposed to. Why wouldn't the person "buying" the command get the supply drop but if that person issues the command in the console, they get the supply drop? I've asked about this on David's Discord too.