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Item of a grid not showing on iOS-Devices

Hi
I use a Grid to display some photos with a hover-effect.
When I open the site with an iOS-Device (iPad Pro Softwareversion 13.5.1, and iPhone 8, Softwareversion 12.3.2) then the first element (it is an area of two grid-items) does not show.

Here is the read only link:
Removed shared Link.

I guess it is not a CSS-compatiblity-issue because CSS-grids are supported by current iOS-Devices.

Any idea what I do wrong?

Edit:
Solved it by NOT using a grid:-)

Kind regards
Alain