Very strange. I don't know what causes that problem.

Inserting a figure result to:

\begin{figure}


  \begin{center}


    \includegraphics{}


    \caption{}


    \label{fig:}


  \end{center}


\end{figure}

It should insert instead:

\begin{figure}
  \begin{center}
    \includegraphics{}
    \caption{}
    \label{fig:}
  \end{center}
\end{figure}