I have problems with the \acp from the acro package.
Here an minimal example:
\documentclass[]{article}
\usepackage{acro}
\DeclareAcronym{MP}{
short = {MP},
long = {Member of Parliament},
long-plural-form = {Members of Parliament}
}
\begin{document}
\acp{MP}
\end{document}
It shows $\Delta$ (MPs)
(latex notation) as result instead of Members of Parliament (MPs)
.