captions to graphics are sometimes centred and sometimes not

[Richard Brown]

Using 1.6.5 on ubunto 9..10, and komascript book, I have some photographs
insert in floats. Each photograph has a caption. Sometimes the captions are
centred on the page, and sometimes they are left justified- and I can see no
difference whatsoever in the procedure I adopted (Insert float, +  insert
graphics) or in the source code. The only difference is that some captions
are longer than others.

For instance, this is centred:

 % Preview source code for paragraph 43

%

\begin{figure}[H]

\includegraphics[width=3.65in]{bolzano_esterno}

\caption{La sala del commiato a Bolzano.}

 \end{figure}



And this is left justified:

 % Preview source code for paragraph 45

%

\begin{figure}[H]

\includegraphics[width=3.65in,height=2.3in]{bolzano_crocefisso}

\caption{Bolzano, il catafalco. ~Da notare i simboli religiosi non \protect
\\

sono fissi. }

 \end{figure}



Wherein lies the difference?

TIA

Richard