If the Shinja liquidity pool is locked, why does the number increase or decrease?

The liquidity pool(s) of Shinja and its paired coin (ETH on Ethereum, BNB on the Binance Smart Chain) is what allows trades to occur on decentralized exchanges (or DEXes) such as Uniswap and PancakeSwap through an Automated Market Maker (AMM) smart contract.

When someone trades the paired coin for Shinja, it goes into the liquidity pool, and they are given Shinja in return. When they decide to take some profits and sell their Shinja, it goes back into the liquidity pool, and they receive the paired coin in return.

Naturally as these trades happen, the dollar amount in liquidity changes.