I started a new simple application without settings overridden and there's also a corruption, different though.
procedure TForm1.FormClick(Sender: TObject);
begin
Clipboard.AsText:= 'µs';
end;
Then i paste in a website and get:
µs.
Now the more funny, when writing this answer, I've copied some code from Laz, i.e what you see above, and the literal was also wrong !