Document begins inside of fancyheader

Question

Why do the words "where are we?" appear, not as expected below the HLine, but within the header?

mwe1.tex

\documentclass[a6paper,8pt]{extarticle} 
\usepackage{graphicx,fancyhdr}
\usepackage[hidelinks]{hyperref}
\usepackage{fontspec}
\usepackage[
    margin=5mm
]{geometry}
\fancyhead[L]{
    \begin{tabular}{l}
        \textbf{bladiliboo}  \\
        \textbf{\textit{bladilibli}}\\
        \textbf{\fontspec[FakeSlant=-0.5]{Arial Italic}blabrrr}\\
        \href{http://www.google.com/}{http://www.google.com/}
    \end{tabular}
    \vspace{0.05cm}
}
\fancyhead[R]{\vspace{1cm}\includegraphics[width=5.5cm]{logoPlaceholder}}
\pagestyle{fancy}


\newlength\FHleft
\newlength\FHright

\setlength\FHleft{0cm}
\setlength\FHright{5.7cm}

\newbox\FHline
\setbox\FHline=\hbox{\hsize=\paperwidth%
  \hspace*{\FHleft}%
  \rule{\dimexpr\headwidth-\FHleft-\FHright\relax}{\headrulewidth}\hspace*{\FHright}%
}
\renewcommand\headrule{\vskip-1.1\baselineskip\copy\FHline}
\setlength\parindent{0pt}
\begin{document}
    where are we?\\
\end{document}

Now the logoPlaceholder.eps:

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%%CreationDate: Tue Jun 26 14:39:09 2018
%%Pages: 1
%%DocumentData: Clean7Bit
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%%BoundingBox: 0 0 176 43
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save
50 dict begin
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/Q { grestore } bind def
/cm { 6 array astore concat } bind def
/w { setlinewidth } bind def
/J { setlinecap } bind def
/j { setlinejoin } bind def
/M { setmiterlimit } bind def
/d { setdash } bind def
/m { moveto } bind def
/l { lineto } bind def
/c { curveto } bind def
/h { closepath } bind def
/re { exch dup neg 3 1 roll 5 3 roll moveto 0 rlineto
      0 exch rlineto 0 rlineto closepath } bind def
/S { stroke } bind def
/f { fill } bind def
/f* { eofill } bind def
/n { newpath } bind def
/W { clip } bind def
/W* { eoclip } bind def
/BT { } bind def
/ET { } bind def
/pdfmark where { pop globaldict /?pdfmark /exec load put }
    { globaldict begin /?pdfmark /pop load def /pdfmark
    /cleartomark load def end } ifelse
/BDC { mark 3 1 roll /BDC pdfmark } bind def
/EMC { mark /EMC pdfmark } bind def
/cairo_store_point { /cairo_point_y exch def /cairo_point_x exch def } def
/Tj { show currentpoint cairo_store_point } bind def
/TJ {
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    dup
    type /stringtype eq
    { show } { -0.001 mul 0 cairo_font_matrix dtransform rmoveto } ifelse
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  currentpoint cairo_store_point
} bind def
/cairo_selectfont { cairo_font_matrix aload pop pop pop 0 0 6 array astore
    cairo_font exch selectfont cairo_point_x cairo_point_y moveto } bind def
/Tf { pop /cairo_font exch def /cairo_font_matrix where
      { pop cairo_selectfont } if } bind def
/Td { matrix translate cairo_font_matrix matrix concatmatrix dup
      /cairo_font_matrix exch def dup 4 get exch 5 get cairo_store_point
      /cairo_font where { pop cairo_selectfont } if } bind def
/Tm { 2 copy 8 2 roll 6 array astore /cairo_font_matrix exch def
      cairo_store_point /cairo_font where { pop cairo_selectfont } if } bind def
/g { setgray } bind def
/rg { setrgbcolor } bind def
/d1 { setcachedevice } bind def
/cairo_flush_ascii85_file { cairo_ascii85_file status { cairo_ascii85_file flushfile } if } def
/cairo_image { image cairo_flush_ascii85_file } def
/cairo_imagemask { imagemask cairo_flush_ascii85_file } def
%%EndProlog
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%%EndSetup
%%Page: 1 1
%%BeginPageSetup
%%PageBoundingBox: 0 0 176 43
%%EndPageSetup
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1 0 0 -1 0 43 cm q
0 g
0.75 w
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[] 0.0 d
4 M q 1 0 0 1 0 0 cm
0.555 0.215 m 0.574 0.242 l S Q
q 1 0 0 1 0 0 cm
0.625 42.699 m 0.293 42.285 l S Q
q 1 0 0 1 0 0 cm
175.301 42.75 m 175.25 42.555 l S Q
q 1 0 0 1 0 0 cm
175.27 0.043 m 175.285 0.191 l 175.301 0.289 l S Q
Q Q
showpage
%%Trailer
end restore
%%EOF