What are the most common mobile UX errors during layout sign-off?

The most common mobile UX errors include oversized headlines that force excessive line breaks, undersized touch targets positioned too close together, and contact forms obscured by dynamic virtual keyboards. Sites also frequently suffer from severe page speed slowdowns caused by uncompressed desktop images loading over cellular connections. Unstable visual layouts that shift during load cause users to tap unintended links, generating immediate frustration. Additionally, overly complex drop-down menus designed for mouse hovering often become completely unresponsive on touch displays. Identifying and resolving these layout oversights during quality assurance guarantees a stable and effective mobile interface.