I noticed this when I was having a poke around some site settings today. An arrow symbol is randomly appearing. Images below show examples from two different sites both on latest version of discourse.
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Thanks for the report! The issue can be seen on this site’s settings pages as well. We’ll get it fixed.
إعجاب واحد (1)
I see this has been fixed now. Thanks @j.jaffeux 
إعجابَين (2)