Question Grey rectangles rarely appear in BIOS

[Fastfishy2]

Occasionally as I'm mousing over the tabs in my UEFI BIOS, these faint grey rectangles pop up and quickly disappear if I move the mouse. Always in the same place. Not sure to be worried or not as everything works fine and I don't have them showing up anywhere else. I'm more curious about what might cause it. The blue glow on the bottom of the screen is just the keyboard btw. Rectanges appear under the "Advanced" header.

Motherboard: Asus STRIX B550-A
CPU: R7 5800X3D
RAM: 32GB G-Skill DDR4-3200 CL16 (2x16)
GPU: Asus RTX 4070 DUAL (Latest drivers)
Cooler: Noctua NH-D15S Chromax

Imgur link because I still can't figure out how to embed stuff:

https://imgur.com/a/pBVEjeV

View: https://imgur.com/gallery/pBVEjeV

 

[lvt]

It's just the Bios software, nothing to worry.

Is the latest Bios?