The part of my MWE preamble
....
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyheadoffset[LE,RO]{\marginparsep+\marginparwidth}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\renewcommand{\sectionmark}[1]{\markright{ #1}}
\fancyhf{}
\fancyhead[RO]{\textbf{\nouppercase{Kısım \thesection{}}\quad\textcolor{orange}{$\blacksquare$}\quad}\textit{\rightmark}\quad\quad\textcolor{blue}{\textbf\thepage}}%
\fancyhead[LE]{\textcolor{blue}{\textbf\thepage}\textbf{\quad\quad\nouppercase{Bölüm{ }\thechapter\quad\textcolor{orange}{$\blacksquare$}\quad}}\textit{\leftmark}}%
\fancypagestyle{plain}{%
\fancyhead{} % get rid of headers
\renewcommand{\headrulewidth}{0pt} % and the line
}
....
\renewcommand{\contentsname}{\textit{İçindekiler}}
....
No uppercase, no problem in Chapter names
but uppercase problem in headers
It doesn't İÇINDEKILER. It does İÇİNDEKİLER. As if, this problem seems like only i .
I find another same question. Does anyone know how to fix it?
Note: İ is uppercase of i and ı is lowercase of I in my language (Turkish).
