How to understand what Chrome does not like in the same characters?

Question

Google Chrome

Faced with the fact that Google Chrome underlines the same words in red when checking spelling, but not all.
The text itself: .
.[[Животные]]
No visible differences could be found. I thought that perhaps the Latin alphabet in Cyrillic crept in there, but no.

Double check:

You can try copying the text into the answer window right on the Toaster. If you have spell checking enabled in your browser, then in theory it will have the same effect as mine. What could it be?

Answer 1

Maybe it's in this symbol https://yadi.sk/i/7XM7bnLAVMXHog ? This is copied from your snippet.