Graphic problems, really confused and need some HELP!

Basically when i turn my environment setting to very low in the settings there are some really ugly lines that cut the map in multiple pieces and also some awful color banding across lanes and in the jungle. This issue goes away completely if i turn it to very high, which i can since my PC can handle it with ease but i like the look of low settings better and i'm used to them from my old computer. So maybe you're like "well that's normal since you're using low settings" but what bothers me is that some streamers that use the same specific setting like me (tarzaned for example) doesn't have this issue at all from what i'm seeing in his streams and or youtube videos which are in 1080p. I tried messing around with the graphic settings, like turning everything else on very high and just the environment on very low but the issue is still there. Can some people from this forum test it themselves and confirm it's not just me? Just go into a practice tool game, turn the environment quality setting to very low and see if you have these awful issues. I want to keep using the very low setting but with it looking like this (for me) i'll eventually have no choice but to use very high which i'd rather not due to personal preference. I also want to mention that the lines that cut the map GO AWAY always when the 3rd drake spawns and it changes the map, so despite still being very low setting those lines dissapear completely just like on the very high setting if for example infernal or mountain drake spawns and changes the map for that specific drake element (but the color banding from the third picture is still there).

PS. Just for reference, here's an random league video i found with the very low settings on who DOES NOT suffer from this issue https://www.youtube.com/watch?v=YVOYXmRvYg0