What is the source of Class revtex4-1 Warning when compiling a tex file in overleaf?

Question

When working on my paper on overleaf, I notice that the compilation runs with no error and produces the final version of the paper but there is an annoying warning which I don't seem to know its cause as it only points to empty lines between some of my paragraphs in the .tex file. Here is the complete warning message I am receiving.

./my_file.tex: Class revtex4-1 Warning: Deferred float stuck during \clearpage processing.

Does anyone know how to fix it? And here is a short version of my .tex file:

\documentclass[twocolumn]{aastex61}
\usepackage[figuresright]{rotating}

\usepackage{amsmath}

\newcommand{\vdag}{(v)^\dagger}
\newcommand\aastex{AAS\TeX}
\newcommand\latex{La\TeX}

\submitjournal{ApJ}

\shorttitle{short title}
\shortauthors{Smith et al.}



\begin{document}

\title{title}
\correspondingauthor{main author}
\email{some emails}

\author{main author}
\affiliation{main author’s school}

\author{second author}
\affiliation{second author school}

\author{third author}
\affil{third author’s school}

\begin{abstract}
some abstract
\end{abstract}

\keywords{k}

\section{Introduction}
\section{Methodology and Analyses}  \label{Section 2}
\subsection{first subsection} \label{Section 2.1}


%some sections and subsections go in here in the form of paragraphs separated by an empty line by pressing Enter key twice.


\end{document}