Here is MWE:
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[series={A,B,C,D},noend,noeledsec,nofamiliar,noledgroup]{reledmac}
\firstlinenum{1}
\linenumincrement{1}
\Xarrangement[B]{twocol}
\Xarrangement[C]{threecol}
\Xarrangement[D]{paragraph}
\setstanzaindents{3,1,2,1,2,1}
\begin{document}
\beginnumbering
\autopar
% \AtEndEveryPend{\vspace{30pt}}
\edtext{Lorem}{
\Afootnote{A critical note}
\Bfootnote{Critical note in series B}
\Cfootnote{Critical note in series C}
\Dfootnote{loram}}
\edtext{ipsum}{
\Afootnote{An other critical note}
\Bfootnote{Other critical note in series B}
\Cfootnote{Other critical note in series C}
\Dfootnote{ipsam}}
dolor sit amet, consectetur adipiscing elit.
\edtext{Fusce sed dolor libero. Aenean rutrum vestibulum lacus ut pretium. Fusce et auctor lectus. Ut et commodo quam, quis gravida orci. Nullam at risus elementum, suscipit enim a, pellentesque mi}
{\lemma{Fusce\ldots mi}
\Afootnote{A long critical note}
\Bfootnote{Again B}
\Cfootnote{Again C}
\Dfootnote{omit}}.
Morbi commodo, ligula vel consectetur accumsan, \\massa metus egestas velit, eu fringilla leo ante in turpis. Vivamus ut tellus sollicitudin, facilisis ipsum sit amet, \\tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.\\
Morbi commodo, ligula vel consectetur accumsan, massa metus egestas velit, eu fringilla leo ante in turpis. Vivamus ut tellus sollicitudin, facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.
\pstart[\centering]
Morbi commodo,\\
ligula vel consectetur\\
accumsa
\pend
massa metus egestas velit, eu.
facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.
\stanza[\centering]
fringilla leo&
ante in turpis.&
\edtext{Vivamus}{%
\lemma{}%
\Afootnote{%
\stanza[\centering]
ligula vel consectetur accumsan,&
massa metus egestas velit, eu fringilla leo ante in turpis.&
Vivamus ut tellus sollicitudin,&
facilisis ipsum sit amet, tincidunt odio.\&%
}%
}
facilisis ipsum sit&
ut tellus sollicitudin,\&
facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.
\endnumbering
\end{document}
Here in line 38 \pstart[\centering] is closed by \pend in line 42. But, it affects next paragraph and makes it centered. The next paragraph was created by \autopar.
What may be creating problem?