I am making animals harder to find but drop more loot. I got the spawner working just fine but the issue is with the drops. I wanted say for example, cows to drop more raw beef, leather, and bones. But when I kill just one cow I do get the drops of 10-12 beefs + 10 - 12 beefs again, it doesn't happen as much with the leather but it's as if the cow died twice and dropping the item count I listed below.

I'm new to coding and tried my best to follow the examples given in loot well.

[
{
"mob": "minecraft:cow",
"remove": "minecraft:beef"
},
{
"mob": "minecraft:cow",
"player": true,
"item": "minecraft:beef",
"itemcount": "10-12"
},

{
"mob": "minecraft:cow",
"remove": "minecraft:leather"
},
{
"mob": "minecraft:cow",
"player": true,
"item": "minecraft:leather",
"itemcount": "6-8"
}
]

found out that a mod called harder farming was adding extra loot to vanilla animals