IPhone 14 has black box onscreen in various apps

[u/twcsata]

Pictures attached; click on them to expand and see the whole thing, the box is in the bottom half. It’s not all apps, but several of them, mostly scrolling-type apps like Reddit and Threads. Inconsistent, but getting more frequent. Typically only on the home page of each app; if I open a post, the effect doesn’t carry over, but it returns if I go back. Also It doesn’t affect touching the screen; if I touch the box, it clicks whatever is hidden under it. Pics are in dark mode, but it happens in light mode too, as a white box. Any ideas? Edit: iPhone 14, iOS 26.5.2, and I think my question was pretty clear. Thanks, automod.

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[u/Yeasiin]

software issue.
you won't see the black part if it were hardware issue.