Background image resizing issue on mobile up/down scroll

Ever encountered an issue where scrolling up & down on mobile seems to cause the page background image to zoom in & out slightly?

*Doesn't appear to occur on desktop.

In Styles and properties > page background, I've tried changing,

background-repeat: no-repeat;
background-size: auto;
background-attachment: fixed;
background-position: center;
Click to expand...

-to-

background-size: cover;
Click to expand...

-then-

background-size: contain;
Click to expand...

No luck though.

(*the actual image size is 1440 × 1873)

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