I'm not sure what's causing this. The lightning throughout the rest looks good. At first I thought it was because of the fireplace, but I'm not sure how it could change the lightning that much. Here's my full LO, I used LLO basic.

USSEP 

USCCCP

SWF

Reforging to the masses 

Lanterns of Skyrim II V 4.3

Lanterns II/USSEP patch

At your own pace ( ussep ) 

QoL and Bugfixes Compilation 

Immersion and Quality of life Bundle 

Immersive Display Overhaul 

Environmental Removal Bundle 

Unread Books Glow

Cheat Room 

Cheat Room Anniversary Patch 

Wear Multiple Rings 

The Dragonborn Dreams 

Dragon Wall Wisdom 

Get Seriously Overstocked and Rich Merchants 

Ordinnator- Maximum Combat 

Summermyst Enchantments of Skyrim 

Ashara Princes of the woods 

Kakatsuo Thane Weapons Replacer 

Real Wildlife Skyrim SE V1.5 

HQ Perk Interface 

Gildergreen Regrown 

The Paarthurnax Resolution 

  Less Tedious Thieves Guild 

Buy able Golden Claw

Heart of Gold- an Adoption Bundle 

Audio sfx Overhaul 

Carriage and stables Dialogue 

Dawn V2

Hype1 All in One Door Merge 

JS Shrines of the Divines 

Skytone standing stones alt

Technicolor Alchemy Overhaul 

Tempers Mystical Dragons Recolor 

Wolves reshaped with true wolves

Elsopa's Quivers Redone 

Elaborate Opulent Textiles 

Divergence Banners 512

Divergence Rugs 512

Elsopa's HD Compilation 

Elsopa's Azura's Redone 

Animated Elsopa's potions for GDB'S 

JS Dragon Claws AE 

Clevercharf's Photorealistic Lock 

Elsopa's New Enchantments 

LW ADDON- Animated World

R.A.S.S 

Dirt and Blood 

Dirt and Blood HD Retexture

Realistic Wildlife Behavior 

AI Overhaul 

Talkative Enemies - A mini Bundle 

Chatty NPCS and Followers

Better Wedding Guest 

Immersive Follower Framework 

Frogs - Mohail monsters and animals

Adventures and Travelers

Bijin AiO 

Bijin AiO USSEP PATCH 

RS Children Overhaul 

RS Children Overhaul AI Overhaul patch 

Heart of Gold/RS CHILDREN patch 

Tempered skins for females 

Tempered skins for Males ( smooth )

KS Hair Skryewolf's pack 

Tempers Kissable Colors Ultra 

Belt-fastened Quivers - XPMSSE version 

GDB'S Elden Beast Edition ( no skysa  ) 

Wintersun - Faith of Skyrim 

Daedric Shrines AiO 

Daedric Shrines AiO- Jk's Temple of Mara patch

Carriage stops of Skyrim xb1

Immersive Carriage and Ferries bundle 

Lively Farms

Lively Farms - USSEP patch 

Jk's Skyrim with Fixes ( swf)

Lively Farms  - Jk's Skyrim patch 

LoS II - JK'S Skyrim patch 

AI Overhaul JK's Skyrim patch 

Jk's Skyrim & CC Fishing patch

Pets of Skyrim- Jk's Skyrim 

Jk's Outskirts AiO

Jk's Outskirts AiO- JK's Skyrim 

Jk's Outskirts AiO- USSEP PATCH 

Jk's Outskirts AiO- AE patch

Jk's Outskirts AiO- CC Alternative Armors patch

Jk's Outskirts AiO-CC Tundra

Jk's Outskirts AiO- CC Wild Horses patch

Jk's Outskirts AiO- Convenient Carriages patch

Jk's Outskirts AiO- AI Overhaul patch

Holidays 

Jk's Skyrim/Holidays patch 

Jk's Interiors AiO 

Jk's Interiors/JK's Skyrim patch 

Jk's Interiors USSEP Patch 

Jk's Interiors AiO fishing patch 

Jk's Interiors AiO CC patch

JK'S Interiors AiO Wintersun patch 

Fortified Whiterun Compatible 

Whiterun City full of life- stripped version 

Breezehome TNF Beds Plus

Proudspire Manor TNF Hearthfire 

Proudspire Manor TNF Beds Plus- CC Fishing patch

Lightning the 7000 steps

Window Shadows Ultimate v 1.4

SKYRIM is Luminous 

SKYRIM is luminous - USSEP patch 

Skyrim is Luminous- CC addon

Skyrim is Luminous- Somber Addon

Dynamic Interior Ambient Lightning 

Guards Armor Replacer 

Opulent Outfits for Monks and Priests 

More To Say 9.0.2 

Hanging moss to Climbing Rose's 

Elrian Plantable Roses 

Flora Atmosphere and Visual FX AiO 

Fishing map markers 

A Clear Map of Skyrim with roads 

Pastel Map Markers 

Female Player Mannequins 

Alternate Start LAL 

Jk's Outskirts AiO- Alternate Start patch 

Relationship Dialogue Overhaul

Jk's Interiors AiO Alt Start patch 

Jk's Interiors AiO RDO patch 

RDO USSEP patch 

AI Overhaul RDO patch 

Pandorable Mega Pack 

Lightning changes