The spacing I'm getting with the `\prescript` command from the `mathtools` package seems wrong. Here is a MWE:

```
\documentclass{article}
\usepackage{amsmath,mathtools}
\begin{document}
$\prescript{14}{2}{\mathbf{C}}^{5+}_{2}$
\end{document}

```

which produces this (red line added to make difference clearer):

![enter image description here](https://i.stack.imgur.com/4PLBW.png)

I suspect it's just a problem with the command itself - if so, is there a known fix? If not, what should I be doing differently? (Of course, regardless of whose fault it is, one solution is just to use a different package for this purpose.)