I'm making a presentation in Beamer, and upon adding a certain number of items in an itemize environment, Beamer creates multiple slides. Each successive slide has one more item added to it. For example,
\documentclass{beamer}
\begin{document}
\begin{frame}
\frametitle{Project Objective}
\begin{itemize}
\item This is the first item.
\begin{itemize}
\item Subitem1
\item Subitem2
\end{itemize}
\item This is the second item.
\begin{itemize}[<+->]
\item Subitem3
%\item Subitem4
\end{itemize}
\end{itemize}
\end{frame}
\end{document}
However, uncommenting Subitem 4 produces two slides:
Adding subsequent subitems creates subsequent slides, each with another subitem added. Adding subsequent items does not create more slides; each new item appears on all slides, indented below where the last subitem should have been. What causes this?
[<+->]