I believe I have my placeholders set up properly but I've noticed my website (mercurypets.com) is only displaying blank white spaces instead of ads (example attached).
Usually, one video ad does pop up, but other than that it's just large blocks of blank space in between paragraphs. This happens several times per article, so it looks pretty rough from a user experience. Is there anything I can do to ensure those ads show — and if not, how can I eliminate those spaces?
Thanks for the help!