It relate to the viewport height of mobile browser, and we can using 100dvh to fix this.

See:

• The Large, Small, and Dynamic Viewports – Bram.us
• Bramus Van Damme: The Large, Small, and Dynamic Viewports - Nicolas Hoizey
• Viewport height is taller than the visible part of the document in some mobile browsers - Nicolas Hoizey
• html - CSS3 100vh not constant in mobile browser - Stack Overflow