It is all very strange Crowbat and I've yet to spot an official explanation from the allies (the UK bombers are only for Iraqi targets).

We can all speculate. Notably is Turkey responsible, as it fears the Kurds as much as ISIS? Or a brutal calculation that pushing tens of thousands of Kurds from the Kobane pocket into Turkey, will bring Turkey in - to create a "safe zone". Incompetence is not a factor, although it appears there are no spotters on the ground to direct attacks.