Why are my columns colliding with package paracol?

I am trying to use the package paracol to display the same biblical verses in several languages. Why are my two columns colliding and how can I prevent this? Also, as a secondary question, I am using the TeXstudio application; why are the \end{nthcolumn*} and \end{nthcolumn} commands showing as "unrecognized command"? The source compiles regardless. I have enabled paracol.cwl in the Completion configuration. I am not very skilled with Xetex yet so please explain as simply as you can. Here is my source code:

\documentclass{book}
\usepackage{fontspec}
\usepackage{paracol}

\newcommand{\omission}{\hspace{6pt}$\cdots$\hspace{6pt}}
\newcommand{\at}{\,·\enspace} % Greek ano teleia
\newcommand{\setcoptic}{\noindent\setmainfont{Antinoou}}
\newcommand{\setgreek}{\noindent\setmainfont{GFS Porson}}

\begin{document}
\begin{Large}

\begin{paracol}{2}

\begin{column}
\setcoptic
\omission ⲉⲅⲛⲱ⳯ \omission ⲉⲛ ⲧⲟ\omission ⲟⲩⲧⲟ\at\omission ⲡⲏⲅⲅⲉⲓ\omission ⲉ ⲉⲅⲟ\omission ⲥⲏ\omission
\end{column}

\begin{column}
\setgreek
καὶ εἶπεν αὐτῷ Ἀβιμέλεχ Οὐκ ἔγνων τίς ἐποίησεν τὸ πρᾶγμα τοῦτο\at οὐδὲ σύ μοι ἀπήγγειλας, οὐδὲ ἐγὼ ἤκουσα ἀλλὰ σήμερον.
\end{column}

\begin{nthcolumn*}{0}
verse 27 goes here
\end{nthcolumn*}

\begin{nthcolumn}{1}
verse 27 goes here
\end{nthcolumn}

\end{paracol}

\end{Large}
\end{document}


After reading through the paracol documentation further, I found that setting \setcolumnwidth{30pt,30pt} fixed my collision issue. I am not sure if this is the most proper answer and still welcome other answers or an explanation of why this works.