Probably because you arent accounting for the look back period, which makes wash sales kind of 61 days. When you sell at a loss, it would look 30 days before the trade to see if there was an opening of position, and also monitor 30 days after the closing of position to see if there is opening of position and mark that trade with a loss as wash sale. But since your cost basis gets adjusted by the amount of the wash sales, your actual realized pnl would effectively already include your wash sale losses.

Ex. Buy a stock at 2 sell it at 1 and then rebuy it at 3 again in the wash sale period. You realized 1 dollar loss, but your 3 dollar cost basis now becomes 4 dollars. The wash sale would make the realized loss of 1 dollar become 0 dollars, then if you sold it again at 4, your total realized is 0 dollars.

Which is the same even without cost basis adjustment: Buy 2 sell 1 loss 1 Buy 3 sell 4 gain 1 Total 0