iPhone X Is this a oled display problem?

[Natya Sadella]

i noticed in the wikipedia app (dark mode) that those grey blocks with the text are weird. Is this oled related?

Made a short video:

https://imgur.com/a/48gbEGU

(Yes I know, no one uses the app so wonky but you can see it at normal use too)

 

[1050792]

Yes, when you scroll with dark backgrounds in OLED you can see them floating.