Yaroslav Hello Heather here I hope you are well. I have taken a look at your Ezoic dashboard and can see that this site is waiting on approval from Ezoic and so ads wont show until this has been completed. This can take up to two weeks to do.
I have reset the ad placeholders for you from our side, please wait 2 hours and then re-check to see if the message of the placeholders still being generated has gone from the plugin. many thanks