Why Appen, Brainchip, Liontown, and Mesoblast shares are falling today

In early afternoon trade, the S&P/ASX 200 Index (ASX: XJO) has found its legs after a subdued start and is pushing higher. At the time of writing, the benchmark index is up 0.4% to 8,235.3 points.

Four ASX shares that have failed to follow the market higher today…