This bug occurs in the profile demo page of adminLTE3.
What we should observe:

What we actually have:

<div class="post">
<div class="user-block">
<img class="img-circle img-bordered-sm" src="../../dist/img/user1-128x128.jpg" alt=
"user image" /> <span class="username"><a href="#">Jonathan Burke Jr.</a> <a href=
"#" class="float-right btn-tool"></a></span> <span class="description">Shared
publicly - 7:30 PM today</span>
</div><!-- /.user-block -->
<p>Lorem ipsum represents a long-held tradition for designers, typographers and the
like. Some people hate it and argue for its demise, but others ignore the hate as
they create awesome tools to help create filler text for everyone from bacon lovers
to Charlie Sheen fans.</p>
<p><a href="#" class="link-black text-sm mr-2">Share</a> <a href="#" class=
"link-black text-sm"> Like</a> <span class="float-right"><a href="#" class=
"link-black text-sm"> Comments (5)</a></span></p><input class=
"form-control form-control-sm" type="text" placeholder="Type a comment" />
</div>
Thanks for the report, I'll check it out in the next days posts with photos bugs also.
Also on cards at Starter page
I've added a fix for this issue and also for the card-text issue in my PR #2256
thanks!