latex insertgraphics

Apparently there is a kind of bug:

\begin{figure}[htb]
\centering
\includegraphics[width=0.8\textwidth]{./images/figure.jpg}
\caption{AFM schematics \cite{Aierken}}
\label{fig:AFM}
\end{figure}

gives a reference to Figure 6 (which is the number under the figure)
whereas this:
\begin{figure}[htb]
\centering
\includegraphics[width=0.8\textwidth]{./images/figure.jpg}
\label{fig:lala}
\caption{kdlseiosj}
\end{figure}

gives 3.1.2 as a reference while the number under the picture is 7.