Bug Report: Grey Line Issue in Relume Navbar Header

i think there is a bug with the Untitled Navbar in the Relume library here is the read only link, the bug is in the navbar of the header - there is a grey line under the navbar that doesn't go away, and isn't showing in the settings or anywhere else https://preview.webflow.com/preview/txf-web?utm_medium=preview_link&utm_source=designe[…]7deffad58035ab0959a32964612455d4&locale=en&workflow=preview