Front Right Tyre - Outer Tread 5.5, Middle 3.5, Inner 4.5 - alloy mishaped

Front Left Tyre - Outer 5.5, Middle4.5, Inner 4.5 - alloy mishaped

Both rears - Outer 6.5, Middle 6.5, Inner 6.5 - all ok

What's weird is they have just been swapped around (front and reared) as I had new front tyres fitted at the start of the month so in essence the wheels on the front were until recently running on the rear.
I would have thought these would be the wheels that would have been mishaped if any as they had covered the last 24,000 miles on the front although I have no recollection of hitting any potholes or such in any event. THe car is 14 months old. Is this anything to worry about? The car feels fine with no imbalance through the steering wheel or my backside - bizarre.
