flex-wrap not working as expected in Safari

On the homepage of http://www.shopifyexperte.de/ there are two flex-box modules, one under "Kundenstimmen" and one under "Neueste Beiträge...". The inner boxes are supposed to wrap when they go below 220px and not grow above 30% width. This works in latest Chrome, FF and Opera (all on Mac), but in Safari 8.0.5 (Mac) and any iOS browser the boxes never form a row even if there's enough room. They always wrap, each one on a row of its own.

The CSS for the container:

.homepage-testimonial-container {
	display: flex;
	display: -webkit-flex;
	-webkit-flex: 1;
	flex: 1;
	-webkit-flex-direction: row;
	flex-direction: row;
	-webkit-flex-wrap: wrap;
	flex-wrap: wrap;
	-webkit-justify-content: space-between;
	justify-content: space-between;
	-webkit-align-items: flex-start;
	align-items: flex-start;
	margin-top: 1em;
}

The CSS for the boxes inside the container:

.homepage-testimonial {
	margin-bottom: 1em;
	min-width: 220px;
	max-width: 30%;
	-webkit-flex: 1 1 auto;
	flex: 1 1 auto;
}

If I disable -webkit-flex-wrap (effectively setting it to nowrap), all boxes line up in a row but eventually overflow the container when the browser window gets too narrow.

Is this some kind of bug in Safari/Webkit or am I doing something wrong here?

It seems this is a bug in Safari. In a separate issue, I tested using the min-width in place of auto in lines where you say something like -webkit-flex: 1 1 auto;.

This question has some info: https://stackoverflow.com/a/30792851/756329

Set child elements like this seems to work for me

flex: 1 0 auto;

I had a similar issue in Safari (9.1.3) with the Bootstrap 3 grid system (e.g. col-md-4) in combination with flex. I solved it by setting margin: 0 -1px; on the col items and flex-wrap: wrap; on the wrapper.

I'm using Safari 11.0.1 and the bug persists. I use Bootstrap 3 combined with display: flex on my .row elements. I added following to my css to target the column elements. There seems to be something about the width percentages in Safari that aren't being honored correctly.

.row [class*=col-]{
    margin:0 -.3px;
}