If at the time of a trade, there are 100 spLP tokens representing 100 FTM and 100 BOO, each spLP token would be worth 1 FTM and 1 BOO.
If one user trades 10 FTM for 10 BOO, and another traded 10 BOO for 10 FTM, then there would now be 100.02 BOO and 100.025 FTM in the pool.
This means each LP token would be worth 1.00025 FTM and 1.00025 BOO when it is withdrawn.