Not trying to second guess bee thought processes but this does not happen when there is a flow on or feeding is being done.
I suspect that although it looks like they are chewing the wax (and indeed are) I suspect the main issue is that they don't like metal and are actually trying to remove it, and the removal of the wax along the wires is just so they can attempt the futile task of wire chewing. If the wire is poorly embedded you often see the wire pattern manifesting itself as a line of gaps in the brood for example. A feed or a decent flow and they will still make a decent comb of that one Kitta.
A second reason can be that they are utilising the wax elsewhere. They do move it around a bit from time to time, again usually when there is no flow or feed to stimulate wax secretion.
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