I use the `enumitem` package:

```
\usepackage[shortlabels]{enumitem}

```

And I put some numeration like this in a theorem environment with `\theoremstyle{plain}`:

```
\begin{prop}
    We have
        \begin{enumerate}[(i)]
            \item $χ(c_M)=-\Id_{σM}$,

        and if $π_0(M)=0$, 
            \item $χ(f_M)=-α_M^{-1}$.
        \end{enumerate}
\end{prop}

```

the `[(i)]` after `\begin{enumerate}` is supposed to make items indexed by `(i)(ii)(iii)`. But in this theorem environment, as texts are italic, the `(i)(ii)(iii)` become funny things like *(i)(ii)(iii)*. How do I fix it?