You are simply misusing the template. (most likely this one)
Both pictures need to be added within the same pair of braces.

% -- Encoding UTF-8 without BOM
% -- XeLaTeX => PDF (BIBER)
\documentclass[]{cv-style} % Add 'print' as an option into the square bracket to remove colours from this template for printing.
% Add 'espanol' as an option into the square bracket to change the date format of the Last Updated Text
\sethyphenation[variant=british]{english}{} % Add words between the {} to avoid them to be cut
\begin{document}
\header{John}{Smith} % Your name
\lastupdated
%----------------------------------------------------------------------------------------
% SIDEBAR SECTION -- In the aside, each new line forces a line break
%----------------------------------------------------------------------------------------
\begin{aside}
%
\section{contact}
123 Broadway
City, State 050022
Country
~
+0 (000) 111 1111
+0 (000) 111 1112
~
john@smith.com
%
\section{languages}
English mother tongue
Spanish fluency
%
\section{programming}
{\color{red} $\varheartsuit$} R
VBA, SQL, Python
\LaTeX{}
%
\end{aside}
\begin{entrylist}
%------------------------------------------------
\entry
{2017}
{Certificado Duck {\normalfont [nível Associate]}}
{%
\includegraphics[width=15mm]{example-image-1x1.png}
\includegraphics[width=15mm]{example-image-1x1.png}
}
{\vspace{-1\baselineskip}}
\entry
{2017}
{Certificado Capybara {\normalfont [nível Associate]}}
{%
\includegraphics[width=15mm]{example-image-1x1.png}
\includegraphics[width=15mm]{example-image-1x1.png}
}
{\vspace{-1\baselineskip}}
\entry
{2014--Now}
{COMPANY 3}
{City, Country}
{\jobtitle{Wombat}\\
Job description. Job description. Job description. Job description. Job description. Job description. Job description. Job description. Job description. Job description. Job description.}
\end{entrylist}
\end{document}
Adrien did not put a suitable license for his class in the past. It has been ripped off by many individuals, the license did allow this. For a long time, the original template repository has been deleted.