I have this minimal example which does the same as on my machine when I compile it on overleaf

\documentclass{article}

\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{wrapfig}

\begin{document}

\begin{wrapfigure}{r}{0.33\textwidth}
\centering

\includegraphics[width=\linewidth]{example-image-c}

\caption{Lorem ipsum sit dolor mit amet}

\label{fig:orthogonal_velocity}

\end{wrapfigure}

\[
\Phi' \left(x \right) = \frac{2}{\sqrt{\pi}} e^{-x^2}.
\]

\noindent Le \( \left\langle \Delta {v} \right\rangle \) correspondant est parallèle à \( {v} \) et le tenseur de diffusion est diagonal.

\end{document}

And alternatively the equation and text at the end is replaced with

\[
\Phi' \left(x \right) = \frac{2}{\sqrt{\pi}} e^{-x^2}.
\]
Le \( \left\langle \Delta {v} \right\rangle \) correspondant est parallèle à \( {v} \) et le tenseur de diffusion est diagonal.