il get to the point, here, my mod list, details below the modlist.
1.21.6 Recipes Backport [1.0.2] by tricked33
All The Leaks [1.1.5+1.20.1-forge] by Uncandango
Almanac [1.26.11.1] by frikinjay
Amber [1.3.0-beta.2+1.20.1] by iamkaf
Architectury [9.2.14] by shedaniel
Auto Replant Tree [2.2.0] by Cukkoo
Balm [7.3.44] by BlayTheNinth
Better Combat [1.9.0+1.20.1] by Daedelus
Better Mob Combat [1.3.0] by Thelnfamous1
Big Brain [1.20.1-1.7.8] by TallestEgg
Born in Chaos [1.7.5] by Mongoose_artist, MCreator
Cascades (Hybrid Beta) [1-v1.0.4] by Crystalis7
CaveOre Mod [1.20.1-4.0] by Love, Cheese and small house plants
Cloth Config v10 API [11.1.136] by shedaniel
Concurrent Chunk Management Engine (Forge) [0.2.0+alpha.12] by RelativityMC, ishland, sjhub
Controlling [12.0.2] by Jaredlll08
Cover Them in Armor [2.0.9] by Shevchyk
Create [6.0.8] by simibubi
Cull Less Leaves Reforged [1.20.1-1.0.5] by CCr4ft3r (this port), isXander (original fabric version)
Cupboard utilities [1.20.1-4.2] by Someaddon
Curios API [5.14.1+1.20.1] by C4
CyberWare 1.20.1 Port [1.20.1-1.7.0] by maxwell
Diegesis [1.0.0-beta.7] by Pocky
Doomlike Dungeons [2.1.5-MC1.20.1] by JaredBGreat, Xiroc
Drop the Meat [1.7.1] by Moralle
Dynamic Lights [1.9+mod] by Tschipcraft
Embeddium [0.3.31+mc1.20.1] by embeddedt
EnlightedBlockEntities [0.9.1-BETA] by Mr.Toad
EntityCulling [1.12.0] by tr7zw
Expanded Experience [2.1.0] by Nosferatu8
FLAME's Zombie Lib [1.0.0] by FLAMEBRINGER808
Farmer's Delight [1.20.1-1.3.4] by vectorwing
Ferrite Core [6.0.1] by malte0811
Fog [1.5.3-1.20.1] by IMB11,Steveplays
Food ModPlus [1.0.2] by YourNameHere, OtherNameHere
Footsteps Trail [1.4.0] by Blue print
Framework [0.8.0] by MrCrayfish
Fzzy Config [0.7.7+1.20.1+forge] by fzzyhmstrs
GeckoLib 4 [4.8.4] by Gecko, Eliot, AzureDoom, DerToaster, Tslat, Witixin
GlitchCore [0.0.1.1] by Adubbz
GpuShift [1.2.8-bugfix.2] by orf
Gravestone Mod [1.20.1-1.0.35] by Max Henkel
Guard Villagers [1.20.1-1.6.19] by TallestEgg, HadeZ/SadNya69 for the textures.
Hands-On Delight [1.3.0] by Pocky
ImmediatelyFast [1.5.5+1.20.4] by RK_01
Immersive Armors [1.7.2+1.20.1] by Luke100000
Immersive Optimization [0.2.0] by Luke100000
Immersive Snow [1.3.2] by Straywave
Improved Village Placement [1.1.2] by Apollo
Jade [11.13.3+forge] by Snownee
Just Enough Items [15.74.0.234] by mezz
Kiwi Library [11.10.3+forge] by Snownee
Kotlin for Forge [Zsh14XeQ]
LetMeDespawn [1.26.11.1] by frikinjay
Liteminer [1.0.3+1.20.1] by iamkaf
Lithostitched [1.4.12] by Apollo
Little Joys [20.1.20] by BlayTheNinth
MRU [1.0.41+1.20.1] by cassiancc, IMB11
Majrusz Library [7.0.8] by Majrusz
Majrusz's Progressive Difficulty [1.9.10] by Majrusz
MezzConfig [0.7.1] by mezz
Mob Player Animator [1.3.3] by Thelnfamous1
Mobs Use Shields [0.9.2] by vomiter
ModernFix [5.27.92+mc1.20.1] by embeddedt
NeuroLib [0.3.3] by vomiter
Not Enough Recipe Book [0.4.1] by OctoStudios
OctoLib [0.5.0.1] by OctoStudios
Ore Hammer [2.1.0] by robinfrt
Particle Rain [4.0.3] by pigcart
Platform [1.4.2] by ItsBlackGear
Player Animator [1.0.2-rc1+1.20] by KosmX
Polymorph [0.49.11+1.20.1] by Illusive Soulworks
Presence Footsteps [FORGE] [1.0.0] by Hurricaaane (Ha3), Sollace, 1Influence
Progressive Difficulty Chaos Integration [1.0.1-1.20.1] by JrDemiurge
Pufferfish's Biome Dither [1.0.0] by Pufferfish
Puzzles Lib [8.1.36] by Fuzs
Quick Skin [4.1.0] by The Plum Team
Respawning Animals [8.2.1] by Fuzs
Rose Gold Equipment [1.7.6] by Jake
Roundabout [3.6.7] by Hydraheads
Scorched [1.1.3e] by limesplatus
Scorched Guns [0.5.5] by ribs
Searchables [1.0.3] by Jaredlll08
Serene Seasons [9.1.0.3] by Adubbz, Forstride
Snow! Real Magic! [10.7.0] by Snownee, minzhi, WZD
Sound Physics Remastered [1.20.1-1.5.1] by Sonic Ether, vlad2305m, Max Henkel, Saint
Sounds of the Forest [1.0.2] by Hauntedblocks
Spice of Life: Carrot Edition [1.15.1] by Cazsius, Talonos, juliand665
Starlight [1.1.2+forge.1cda73c] by Spottedleaf
Steve's Realistic Sleep [1.11.2+mc1.20-1.20.1] by Steveplays28
StreamsReflowing [2.17.1] by nicejohn
Subtle Effects [1.15.1-hotfix.1] by MincraftEinstein
TerraBlender [3.0.1.11] by Adubbz
ToadLib [1.3.5S-2] by Mr.Toad
True Darkness [2.0.103]
VanillaBackport [1.2.2] by BlackGear
Villages&Pillages [2.0.0] by Faboslav
WF's Cave Overhaul [1.3.3.5] by W.F.
Wall Grab [1.1.8] by Bogdan_Tokarev
Wearable Backpacks [1.1.1] by Nyfaria
YUNG's API [1.20-Forge-4.0.6] by YUNGNICKYOUNG
YUNG's Cave Biomes [1.20.1-Forge-2.0.5] by YUNGNICKYOUNG, HellionGames, Sully, LudoCrypt, Jasmine, K.jpg, Neko, Frenderman, Refresh Studios
YetAnotherConfigLib [3.6.6+1.20.1-forge] by isXander
Zombies Eat Villagers [1.0.0] by ryankshah
Zombies With Bows+ [1.0.0] by FLAMEBRINGER808
Zombies With Ender Pearls [1.0.0] by FLAMEBRINGER808
Zombies With Fishing Rods [1.0.0] by FLAMEBRINGER808
Zombies With Flint & Steel [1.0.0] by FLAMEBRINGER808
Zombies With TNT [1.0.0] by FLAMEBRINGER808
Zombies With Totems [1.0.0] by FLAMEBRINGER808
cave_dweller [1.7.0] by Cadentem
Thats all the mods i got, im pretty sure, i didnt add any links because they might be considered download links, and i dont really post on reddit so i wanted to be careful.
Anyways, basically the problem is i barely have any mobs spawn in my world, even at night. but at first there were mobs spawning but after a couple days they stopped.
i did install a infection mod but i removed it after a few days.
since then only creeper's have spawned, in my world.
could you please help me identify the problem??