STABLE version -- 5.1.1130.129

[QZMTCH]

Looks like the SPA source to me, there shouldn't be anything. You may better check the Console and Network tabs for the errors instead.
Here's the same url: https://i.imgur.com/KvKGSH6.png

https://win10tweaker.ru/forum/topic/cent...tid-114212 
This is not just happening to me

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You may better check the Console and Network tabs for the errors instead.

this was done first https://i.imgur.com/k25gZpg.png https://i.imgur.com/RXazuNA.png

I checked on two computers, the site does not form anywhere, did you check it on a clean browser? I remember you also used custom devtools, maybe it has some effect on browser