Duplicated image – theme problem

[matjazzidaric]

Hi
We have a site built on Sailing theme and there is a problem since the last upgrade to wordpress 5.5.
There is an img parameter added to excerpt content and we dont know why. This didnt happen before. The problem happens on page https://www.terme-topolsica.si/posebna-ponudba/ on all link boxes. The code inserted is :

<div class="pgafu-post-content">				
   <div class="pgafu-post-short-content">
    <img width="1920" height="1078" src="https://www.terme-topolsica.si/wp-content/uploads/2019/03/DJI_0208-min-1.jpg" class="attachment-post-thumbnail 
     size-post-thumbnail wp-post-image" alt="" loading="lazy" srcset="https://www.terme-topolsica.si/wp-content/uploads/2019/03/DJI_0208-min-1.jpg 1920w, 
     https://www.terme-topolsica.si/wp-content/uploads/2019/03/DJI_0208-min-1-300x169.jpg 300w, https://www.terme-topolsica.si/wp- 
     content/uploads/2019/03/DJI_0208-min-1-768x431.jpg 768w, https://www.terme-topolsica.si/wp-content/uploads/2019/03/DJI_0208-min-1-1024x575.jpg 1024w, 
     https://www.terme-topolsica.si/wp-content/uploads/2019/03/DJI_0208-min-1-600x337.jpg 600w" sizes="(max-width: 1920px) 100vw, 1920px"> Paket za 
     turistične bone!
   </div>
<a href="https://www.terme-topolsica.si/posebna-ponudba/nocitev-z-zajtrkom/" class="readmorebtn">Preberi več</a>
/div>

Printscreen

We would need your help with this. There is a plugin “Post grid and filter ultimate” used on this page and their support says it is the problem with excerpt usage of the theme.

I have looked at the database values of excerpt and is without img parameter so it is added somehow automaticaly.

Please help!
Thanks
Matjaz

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