Hi Kate,
Thanks for reaching out.
It seems that the margin-top attribute value is set to 20px by default and that is the reason for your issue. I would suggest you reset that value once from the Theme Options > Header > Mobile Button. Please find the screenshot describing the attribute and settings.
I have also found that you are still using an older version of the theme on a few of the sites, please note that a few hours ago we have released another version of the theme with some fixes, I would recommend you to update your theme to the latest one.
I would also suggest you follow the below steps while updating to the latest version of the theme.
- Delete the Cornerstone
- Update the X theme to the latest version on automatic updates
- After the X theme is updated, use the link in the dashboard to automatically install the Cornerstone. It will be at the latest version
Hope it helps.
Thanks