Text Formatting ⇒ Apostrophe in title section gets rendered as a section symbol

[Tolaso]

I'm not sure if this is the proper forum to post the question but here goes.

I'm using the memoir document class to typeset a book for my math class. However, when I type the section

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\section{Κανόνας \textlatin{DeL' Hospital}}
 
 
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while in the TOC it gets printed right as

Κανόνας DeL' Hospital

in the header of the current chapter it gets printed as

Στιγμιότυποαπό2018-04-0713-36-19.jpg (5 KiB) Viewed 4172 times

I'm presenting the entire preamble since in a vanilla document I cannot reproduce the problem , although in the header of the vanilla I don't get that weird symbol but I got ' either.

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Code, edit and compile here:

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\documentclass[11pt, a4paper]{memoir}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\renewcommand\qedsymbol{$\blacklozenge$}
\usepackage[shortlabels]{enumitem}
\usepackage{cancel}
\usepackage{bigints}
\usepackage[most]{tcolorbox}
\usepackage[utf8]{inputenc}
\usepackage[english, greek]{babel}
\usepackage{multicol}
%chapter style ( Bringhurst chapter style)
\usepackage[T1]{fontenc}
% not then font used by Bringhurst, but anyway:
\usepackage{libertine}
% we want to letterspace uppercased words and those in small caps, so:
\usepackage{microtype}
% the chapter style:
\usepackage{xcoffins,xcolor}
\NewCoffin\main
\NewCoffin\titleline
\NewCoffin\chapternumber
\makechapterstyle{Bringhurst}{%
    \renewcommand*\chapterheadstart{}
    \renewcommand*\printchaptername{}
    \renewcommand*\chapternamenum{}
    \renewcommand*\afterchapternum{}
    % numbered chapters:
    \renewcommand*\printchapternum{%
        \SetHorizontalCoffin\chapternumber{%
            \textcolor{black!10}{\thechapter}%
        }%
        \ScaleCoffin\chapternumber{8}{8}%
    }
    % unnumbered chapters:
 
 
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Run LaTeX here

[Courtney McDaniel]

Hah, I think that this problem is so common among beginners, even a post dedicated to it)

Thanks, it worked!