Again this is due to the same styling reason you have.
I recommend to remove the negative constraints your theme have defined over the whole images in style.css (Line 243):
And if you benefit from this line of style, try to give your targeted images a class name and then assign these styles only for the images tagged with your chosen class name. For instance:
<img src="???" class="img-auto">
Again applying a style to a specific HTML tag like <img> is a bad practice, and it will cause you more problems in the future.
And it is even forbidding for plugin developers to override a specific HTML tag style, such as (span, img, div, & etc), because this will mess the whole plugin users websites. So even for me I can't fix this issue from my end, because if I do, other users websites will start to collapse.
I know that my answer was verbose :)
But I hope this will help.
Thanks for asking,