Low chance of drop for passive mobs

I downloaded some mods that add food and other stuff, but noticed passive mob's drops are lower (only 8 pork for more than 200 pigs killed and 7 chicken for 120 chickens killed)

Here's a list of all mods (idk if other mods have anything to do with it, but I'll list everything anyways):

FOOD RELATED: Spanish Delight Alex's Cave Delight Farmer's Delight Compact Crate Delight Aquaculture Delight Farmer's Delight Cultural Delights End's Delight Vintage Delight Nether's Delight Miner's Delight Ocean's Delight Fruits Delight Haunted Harvest Large Meals

STRUCTURES: Yung's Better Dungeons Yung's Better Nether Fortresses Yung's Better Strongholds Yung's Better End Island Yung's Better Mineshafts Yung's API Structory Alex's Caves Biomes O' Plenty Explorify Dungeons and Taverns Better Village Towns and Towers

RANDOM STUFF: Tree Harvester SlabsExpanded Dynamic Lights Sound Physics Remastered Simple Crop Harvest Ore Harvester Durability Tooltip Useful Backpacks EnchantmentDescriptions AmbientSounds

MOBS: Alex's Mobs Living Things

Let me know if I should add Performance and Libraries mods, and thank you to anyone who answers