It is due to this bit of CSS in http://www.jehovahs-witness.com/static/styles/main-15abe09721.css:
.post-body {
-moz-hyphens: auto;
word-break: break-all;
word-wrap: break-word;
}
According to this page, it should perhaps be changed to:
.post-body {
-ms-hyphens: auto;
-moz-hyphens: auto;
-webkit-hyphens: auto;
hyphens: auto;
-ms-word-break: break-all;
word-break: break-word
word-wrap: break-word;
overflow-wrap: break-word;
}
...for maximum browser compatability.