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I've tried to fix the problem by following the 'How to write a thesis in latex' series.
Below is my main.tex

\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\graphicspath{ {images/} }
\usepackage{appendix}
\usepackage[a4paper,width=150mm,top=25mm,bottom=25mm ...

Thank you for the response.
Hopefully these screenshots will help. I'm also using zotero if that makes a difference.

With regards to why i'm using \citep - this was recommended by a friend who's been using overleaf for a little longer than me. She used code identical to mine and has had no issues.

I've just started using overleaf to write my thesis and I'm having some problems with my citations.

I'm using \citep{} to add each citation, but when I compile the document, my citations aren't displaying as I thought they would.
E.g. rather than (Monteiro, 2018) it's showing as (Monteiro'household ...