Welcome to elo hell. Welcome to riot's exiles. Welcome to the a$$fucked by riot ppl. We saldy welcome you to our pathetic gaming experience.
Now after this glorious introduction i will explain what happens and you lose so much.
The game is bases on silly ranking system originaly created for chess players i think by some dude whose name was elo ( again not sure) but anyways the elo ranking system pretty much has a number for each player. The so called MMR ( elo and mmr are the same thing) the MMR is supposively your skill level, and determines those lp gains and losses.
Now mmr ( match making rating) is matching you with people of similar mmr. If you are in bronze 3 your mmr should be aproximately 900 ( not entirely sure) how ever if have in the past lost many, many ,many games your mmr will have droped by alot. So your mmr might be 600, now this means your mmr is way lower than your league average and thus the system is trying to hild yoi down. Therefore it rewards you with fewer points and it takes away a tone.
Mmr used to be visible to players but for some reason riot decided to hide it. There is a website that estimates your mmr. Its not entirely accurate but pretty close. Type in Google " op gg" and you will find it.
Your MMR ONLY depends on wins/losses, KDA doesn't matter, in game stats don't matter, whether you place one ward or 50 it doesn't matter, whether you get 400 cs or 40 it doesn't matter its just wins/losses.
MMR doesn't reset, another genious wau for riot to fck you up and throw accounts to trash, accounts that you might have spent shit loads of real money in.
The only way for your mmr to go up is to win approximately 60% of your games. Your lp will not go up until your mmr matches the mmr of your league and thus the system considers you to be a better player.
Here is where i am opposed to the system.
If mmr matches you with players of the same skill level, the odds of winning are 50-50 so really hard to maintain a high win ratio, and thus really hard to standardize your mmr. So elo hell.
Just so you don't feel alone i gain 9-12 lp and lose 19-24...