So I might be able to shed light on this.
My little brother lives in dalkeith. He wrote to the council along with many others to complain about the overflowing bins on the estate where he lives and the surrounding area.
Received a lovely letter back saying (I'm paraphrasing from a second hand story btw) "Thanks so much for your enquiry and bringing this to our attention. Upon review it seems that many of the installed bins were incorrectly allocated and therefore were not being emptied, as the emptying team [presumably a different team to that which puts bins out] were not aware of them.
To remedy this situation we've removed the extraneous bins and you can rest assured that all the remaining bins will be emptied regularly"
Perhaps something similar?
Should note that the amount of litter and dog poo bags blowing around has increased in their area.