If previously there were 100 HLP tokens representing 100 ETH and 100 HLP each token would be worth 1 ETH & 1 HLP.
If one user trade 10 ETH for 10 HLP, and another traded 10 HLP for 10 ETH, then there would now be 100.025 ETH and 100.025 HLP.
This means each LP token (HLP) would be worth 1.00025 ETH and 1.00025 HLP now when it is withdrawn.