Why a2 Milk, Cann, Flight Centre, & GPT shares are tumbling lower

In afternoon trade, the S&P/ASX 200 Index (ASX: XJO) is on course to record a small gain. At the time of writing, the benchmark index is up 0.1% to 7,400.7 points.

Four ASX shares that have failed to follow the market higher today are listed below….