Corrected entry: The terrorists who wear IFBs, wear them incorrectly. They have them clipped on the front of their shirts, and then put in the ear. The correct way is to have the cable clipped onto the back of the shirt, and then cord goes over the ear, and into it, making sure the cords do not get in their way.
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Correction: They are terrorists, not trained soldiers, likely not trained in how to properly wear the IFB's. Aside from that, it would be a character(s) mistake, not a movie mistake.
It could also be a "crew thing" where all their guys just wear them like that.