Shift of labels in subfig

Question

I have
documentclass[12pt]{article}
usepackage[left=10mm, top=20mm, right=10mm, bottom=20mm]{geometry}
usepackage{graphicx}
usepackage{subfig}
usepackage[font=scriptsize]{caption}
captionsetup{width=0.8textwidth}
begin{document}

begin{figure}[h!]
centering
subfloat[xxx]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[yyy]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[zzz]{includegraphics[width=0.25textwidth]{1.jpg}}
caption{.}
label{appendix}
end{figure}
end{document}

and obtain

Could you help me, what can I do with this horizontal shift for (a) xxx, (b) yyy, (c) zzz?
UPD:
Such example
documentclass[12pt]{article}
usepackage[left=10mm, top=20mm, right=10mm, bottom=20mm]{geometry}
usepackage{graphicx}
usepackage{subfig}
usepackage[font=scriptsize]{caption}
%captionsetup{width=0.8textwidth}

begin{document}
title{title}
author{authors}
date{}
maketitle
abstract{abstract}
section{Introduction}
just main text just main text just main text just main text just main text just main text just main text just main text just main text just main text just main text
begin{figure}[h!]
centering
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
caption{just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption}
label{appendix}
end{figure}
end{document}

Result

It seems it caused by the width of the title.

Zarko · Accepted Answer

As I said in my comment, caption text cannot be wider than textwidth. Cause of your problem is command command abstract{abstract} which shrink followed text to width of abstract text.
Correct MWE for your case is:
documentclass[12pt]{article}
usepackage[hmargin=10mm, vmargin=20mm]{geometry}
usepackage[demo]{graphicx}
usepackage{subfig}
usepackage[font=scriptsize]{caption}
%---------------- show page layout. don't use in a real document!
usepackage{showframe}
renewcommandShowFrameLinethickness{0.15pt}
renewcommand*ShowFrameColor{color{red}}
%---------------------------------------------------------------%
usepackage{lipsum} % for generating dummy text

begin{document}
title{title}
author{authors}
date{}
maketitle

begin{abstract} % <--- correct syntax
lipsum[66]
end{abstract}   % <---

section{Introduction}
lipsum[11]
    begin{figure}[ht]
    centering
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
qquad
subfloat[]{includegraphics[width=0.25textwidth]{1.jpg}}
caption{just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption just a caption}
label{appendix}
    end{figure}
end{document}

which gives expected result:

(red lines shows page layout).
As you can see, the width caption text is equal to width of text. Also subcaptions are on the right place. Is this what you after?

Shift of labels in subfig

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