When this occurs it can be caused by a couple of mundane things:
the browser is too zoomed in, and needs to be zoomed out of / returned to 100% view (CTRL - / CTRL 0 on PC, CMD - / CMD 0 on Mac)
the default font sizing of your browser is too large and needs to be reduced
Otherwise, the other most common culprits are browser extensions, ad/pop-up blockers, or something else usually only connectivity-related affecting the visual elements of the site. I'd also recommend going through the usual troubleshooting steps to narrow down what the source of the issue may be - such as checking other browsers and devices if you have access to them, to see if the issue is also occurring on those. When I look at the scheduling page for your account, it's a single line, as expected, and the top bars of your editing and scheduling pages show as expected, which indicates it's a more localized issue.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ William A Community & Social Media Support