Describe the bug

Tbh i'm not familiars with mods and shaders. So maybe i set something wrong. The bug is : when i look around, the mountains, village etc stay in the horizon like an old game bug, you can see it in the video, maybe i did something wrong, but i think it's a bug x)

And here, the video (i can make an other one if you want)
https://streamable.com/lcjwqj (tell me if that doesn't work, it's the first website i found to upload videos XD)
(or tell me how to do it in another way, the video is 50Mb, github said 10Mb, and the website said "link will expire in 2 days TT.TT)

Describe how your minecraft is set up

Here is the F3 screenshot :

Describe how to reproduce the bug

idk i just moved lmao

Oh yeah, that might help : i'mtrying to use the mod distant horizon :/

Thank you for your help !

okey hummm, i just think my pc isn't enough powerful to support all of this...

this is a super common issue, not caused by hardware or anything like that, worry not.
try restarting the game,
or Go to Distant horizons settings -> advanced options -> graphics -> rendering -> change transparency to complete
also The "Alex's caves" mod can also cause this. disable Biome Ambient Light Coloring in the alex's caves mod config