\begin{filecontents*}{rubric1.tex}
	%% rubric1.tex
	\begin{rubric}{Rubric 1}
		\entry*%
		Entry 1.
		\entry*%
		Entry 2.
	\end{rubric}
\end{filecontents*}


%% doc.tex
\documentclass{curve}

\begin{document}
% The boxes are just used to show the bug more clearly, you
% can comment or delete them.
\fbox{%
	\parbox{6.3cm}{%
		\makerubric{rubric1}
	}
}
\end{document}