QuipuSwap is an automated market-making (AMM) decentralized exchange (DEX) on the Tezos blockchain.
To provide liquidity to AMM, QuipuSwap uses liquidity Pools the same way as UniSwap. Please watch this video that explains what a Liquidity Pool is. From this video, you will understand why the token ratio in your pool changes and why you may receive a different number of tokens for the same share's (liquidity pool tokens) number. For instance, in one time for 100 shares you may receive 50XTZ and 200 kusd, in other 55XTZ and 190 kusd.
If you want to learn how you can earn on QuipuSwap, please read this article
In case, you want to read technical documentation, visit this resource.