It looks like your screenshots are using a different icon set than stock elementary OS Juno. According to the publishing requirements (emphasis added):
Your appdata.xml file must contain a screenshot tag that references a screenshot of your app with elementary OS default settings including the GTK stylesheet, icons, window button position, etc.
Thanks again for submitting your app, and hopefully we can get these couple of small issues resolved so it can be published to users. :smile:
Thanks for the heads up. I've updated the screenshots both in the project and at the URLs listed in the appdata (a hard refresh might be needed there).
It looks like your screenshots are using a different icon set than stock elementary OS Juno. According to the publishing requirements (emphasis added):
Thanks again for submitting your app, and hopefully we can get these couple of small issues resolved so it can be published to users. :smile: