How to solve the problem, WebView dimming LinearLayout?

Question

Java

Good day! The question may be strange, but the problem is also the same)

Look, this is what the application looks like in its normal state:


As soon as I click on one of the list items, a window with more detailed information expands, when suddenly it turns out that on one of the devices it comes out like this

: the interesting thing is that only when the WebView has loaded the HTML page
And here is how it looks when this horror has not yet appeared:

I honestly don’t understand what this could be connected with, who faced something like this?