Since WordPress 4.8, text widgets may occasionally add an extra paragraph
<p> HTML element above the feed. This can add unwanted white space. You can remove this by opening the widget editor (Appearance->Widgets in the dashboard) locating the text widget with the feed in it, switching to the “text” tab, and removing any
<p> HTML you see above the feed.
If that doesn’t seem to work or you can’t find the