Btukfyl

I have an article I'm working on with 11 figures in total and 60 equations. They are all properly labeled, and I made sure to put label after caption in my figures. (Using )

Whenever I reference an equation or figure, I get an warning that the label is undefined. But it still compiles and the references seem to work. Except for the last 3 figures, which have the same issue, but when I reference them, the document won't compile.

Here's an example figure:

begin{figure}

    includegraphics[width=0.8textwidth]{diverge.png}

    centering

    caption{Performance Analysis}

    label{fig:9}

end{figure}

Later on in a paragraph, I have:

The results are presented in Figure ref{fig:9}.

Nothing different from what I have going on earlier in the document.

Here are my packages:

documentclass[a4paper]{article}

usepackage{fullpage}

usepackage{parskip}

usepackage{tikz}

usepackage{hyperref}

usepackage{xcolor}

definecolor{light-gray}{gray}{0.95}

newcommand{code}[1]{colorbox{light-gray}{texttt{#1}}}

usepackage{amssymb}

newcommand{Lagr}{mathcal{L}}

usepackage{mathtools}

usepackage{amsmath}

usepackage{graphicx}

DeclareGraphicsExtensions{.png,.pdf}

Any ideas?

EDIT: I'm using latexmk in VS Code by the way, and I just closed and re-opened it. Now all of my references are appearing as '??'.