Odd rendering for productions of `p` inside `\nonterms{h,e,CL,pie,p}`

\begin{figure}[h]
  \centering
  \scalebox{0.75}{%
    \begin{minipage}{\linewidth}
      \begin{mdframed}
        \nonterms{h,e,CL,pie,p}
        %\nonterms{p}
        \label{fig:2}
        \caption{Terms}
      \end{mdframed}
    \end{minipage}
  }
\end{figure}

Renders to this:

Not good!