Some users have reported not seeing the banner for the WMF board vote in certain countries.
Please see also the thread "Banner for voting board not displayed in Italian Wikipedia" on the Wikimedia-l mailing list.
@Philippe-WMF reports that he allocated banners into buckets A & B, but CN put them in A & C but not B (which he saw in the UI) and only sent readers into buckets A & B, such that the banner in C was never displayed. He tried to turn off bucketing and it wouldn't turn off (but now it looks like each campaign has only 1 bucket, Philippe thinks this happened when he took the 2nd banner out).
As a workaround, he has made 2 campaigns (1 with each banner) and balanced them. Obviously this is not ideal.