linux下cp一个目录后文件内容不一样了？？

hereyou

装的suse10.1，四个sata，一个独立的，另外三个组成soft raid5 to /home，执行
cp -rp /home/fs /home/exchange/fs 后diff其中的文件发现：
diff -r fs1/Abaxx_docs/docs/API/abaxx/commerce/payment/PaymentOption.html fs2/Abaxx_docs/docs/API/abaxx/commerce/payment/PaymentOption.html
675,676c675,676
< <A NAME="getPreAuthorizedAmount()"><!-- --></A><h3 class=MethodHead>getPreAuthorizedAmount (<span class=Method@eadParams></span>)</H3>
< <pre C,ASS=MethodSignature>public <A
             ^
HREF="../../../abaxx/core/common/Measure.html">Measure</A>  <B>getPreAuthorizedAmount</B> ()</PRE>
---
> <A NAME="getPreAuthorizedAmount()"><!-- --></A><h3 class=MethodHead>getPreAuthorizedAmount (<span class=MethodHeadParams></span>)</H3>
> <pre CLASS=MethodSignature>public <A
              ^
HREF="../../../abaxx/core/common/Measure.html">Measure</A>  <B>getPreAuthorizedAmount</B> ()</PRE>
703c703
< <DT><B>Returns:</B><DD>St0ing The value of the property<D><B>See
                                                    ^
Also:</B><DD><A HREF=".,/../../abaxx/commerce/payment/P9ymentOption.html"><CODE>aymentEption</CODE></A></DL>
---
> <DT><B>Returns:</B><DD>String The value of the property<DT><B>See
                                                   ^
Also:</B><DD><A HREF="../../../abaxx/commerce/payment/PaymentOption.html"><CODE>aymentOption</CODE></A></DL>
705c705

有很多文件内容和源文件不一样了，或缺少字符或改变了字符，请教会是什么样的原因导致这种现象的，希望告知一下，多谢了！