Why does the language automatically switch in macos when you enter a dot, comma, and other characters?

Question

macOS

Tell me, why does the language automatically switch in macos when you enter a dot or comma (w-z control + option + ,) and other characters? Also, not the first time it is switched by hot keys command + space. the country icon at the top changes, and when you start typing, does the layout stay the same? right now I put a question mark and he switched to English.

In the settings of the keyboard, the checkbox is unchecked in Automatically switch to the document input source. macOS Catalina, Air 15