Hello guys, I'm having the weirdest error in my gallery at the moment

I bought my hosting & domain name at OVH for my site and gallery (
https://simone-simons.net/). Before, my site was hosted for free by Flaunt and I had to display ads on every page.
When I moved the gallery, I uploaded all the files to my new hosting and also the MySQL database. I also uploaded a new theme.
In the template.php file of my old theme (at Flaunt), I had this line to display the ads :
<div id='div-gpt-ad-1441211811388-0' style='height:90px; width:728px;'>
<script type='text/javascript'>
googletag.cmd.push(function() { googletag.display('div-gpt-ad-1441211811388-0'); });
</script>
</div>
I didn't add this line to my new theme. Yet, when I try to display a picture, I see 2 ad banners, like on this page :
https://simone-simons.net/gallery/displayimage.php?album=681&pid=14298#top_display_mediaWhen I look at the source code, here is what I see :
<table align="center" width="100%" cellspacing="1" cellpadding="0" class="maintable ">
<tr>
<td align="center" class="display_media" nowrap="nowrap">
<table width="100%" cellspacing="2" cellpadding="0">
<tr>
<td align="center" style="{SLIDESHOW_STYLE}">
<center><script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- responsive flaunt -->
<ins class="adsbygoogle"
style="display:block"
data-ad-client="ca-pub-7892222271864999"
data-ad-slot="3482167138"
data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script></center><br>
<a href="javascript:;" onclick="MM_openBrWindow('displayimage.php?pid=14298&fullsize=1','143101295b339d2d1d7d3','scrollbars=yes,toolbar=no,status=no,resizable=yes,width=1605,height=1070')"><img src="albums/userpics/10001/normal_smoonstyle2018-006.jpg" width="600" height="400" class="image" border="0" alt="Click to view full size image" /><br /></a>
<br><center><script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- responsive flaunt -->
<ins class="adsbygoogle"
style="display:block"
data-ad-client="ca-pub-7892222271864999"
data-ad-slot="3482167138"
data-ad-format="auto"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script></center>
</td>
</tr>
</table>
I don't understand where this comes from !

I had a look at all the pages of my new theme and I can't find where these lines are (so I can't delete them). Do you know where/in which file I should look to fix this error ?
Thanks in advance.
(I'm using Coppermine 1.5.46 by the way)