Hi there,
You have this CSS on your site:
/* Limiting Content Column Width */
.entry-content p,
.entry-content ul,
.entry-content ol,
.entry-content h1,
.entry-content h2,
.entry-content h3,
.entry-content h4,
.entry-content h5,
.entry-content figure,
.entry-content > div,
.entry-content blockquote, .comments-area {
max-width: 700px;
text-align: left;
word-wrap: break-word;
margin-left: auto;
margin-right: auto;
clear:both;
}
Image block is basically a <figure>
tag with <img>
inside it so the .entry-content figure
selector affects it.