Marginnote causing unwanted indent

Question

I am writing an exam and am using the following code to insert the marks for the question on the right in the margin.

\newcommand{\mrks}[1]{
    \marginnote{\textbf{#1}}[0em]
    \ignorespaces
}

When I build the code, it causes an indent to occur at the location of the \mrks command. For the command \mrks{1}, an indent one character wide is inserted. This is occurring inside the questions environment as defined below.

% question style
\newenvironment{questions}{
    % change margins for marks
    \begin{adjustwidth}{}{10mm}
% short answer labels
\renewcommand{\labelenumi}{
    \textbf{\arabic{enumi}}}
\renewcommand{\labelenumii}{(\alph{enumii})}

% set questions indent and alignment
\setlist[enumerate]{
    align=parleft,
    labelindent=0em
}    

% set space between questions
\setlist[enumerate,1]{
    itemsep=0em
}

% set alignment of question parts
\setlist[enumerate,2]{
    align=right,
    itemsep=0em,
    topsep=1em,
    labelsep=1em,
}

\begin{enumerate}

}{
    \end{enumerate}
    \end{adjustwidth}
}

Any idea how I can remove the indent?