I recently created this site HERE , and I used flexbox and autoprefixer to align many things on this site.
Now, despite the fact that I use autoprefixer, my client sent me the following screenshots of one of the sections:

As you can see, the images are not centered on the circle. This does not apply to all recent browsers, and in IE 10+ everything works fine in recent browsers.
From what I was able to learn after visiting several SO streams, it can be said that even Safari 5+ supports flex with prefixes. So I have no idea why my flexible code is not working.
HTML:
<figure class="focus-point" data-animation="fadeInUp" data-animation-delay="0.2"> <a href=""> <img src="images/focus-feature-points/2.jpg" alt="focus point"> </a> <figcaption> <h3>Engaging Educational Games</h3> </figcaption> </figure>
And the CSS for the <a> tag is as follows:
.focus-point > a { overflow: hidden; position: relative; border-radius: 50%; border: 3px solid; display: inline-block; height: 260px; width: 260px; display: -webkit-box; display: -ms-flexbox; display: flex; -webkit-box-align: center; -ms-flex-align: center; align-items: center; -webkit-box-pack: center; -ms-flex-pack: center; justify-content: center; margin-left: auto; margin-right: auto; -webkit-transition: all .3s; transition: all .3s; }
The version of Safari that my client uses is 5.1.10.
Why, even though I am using prefix code, is my flexbox code still not working?
I also know that some of the advanced flexbox properties may have problems in older browsers that partially support flexbox (like flex-wrap ), but as you can see, I used only the most basic flexbox properties in my example.
What am I doing wrong?
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