I am using child theme. Site was done 2 years ago and now I do some changes and plugin updates once in a while.
Today were all plugins updated after many months 6 or 9 maybe.
When I look in the code (where those redundant square icons come from), I see path to GP theme.
To “style.css.min”.
See image: and investigate more please on site https://www.ivb.cz/