NextGEN Thumbnails Squished in Safari

My WordPress is up to date, as well as NextGEN Gallery.
The theme I am using is a Twenty Eleven child theme.

Only in Safari (I used version 5.1.7 to check) (as far as I know, it’s only happening in Safari) when viewing my gallery the thumbnails are VERY thin and stretched vertically. You can see the problem here (if the problem shows up on a browser besides Safari, let me know): https://vanhoutenillustration.com/portfolio/illustration/

The only modifications I’ve made to the css of NextGEN Gallery are:

.ngg-gallery-thumbnail img {
	background-color:#FFFFFF;
	border:1px solid #A9A9A9;
	display:block;
	margin:4px 0px 4px 5px;
	padding:4px;
	position:relative;
	width: 100%;
	height: 100%;
}

and

.ngg-album-compact {
	float:left;
	height:180px;
	padding-right:6px !important;
	margin:0px !important;
	text-align:center;
	width:120px;
}

The only things I’ve altered/added to the css of the Twenty Eleven child theme are:

[Large chunk of CSS moderated. Please just post a link to your site]

I have no idea why this is happening.

https://www.ads-software.com/extend/plugins/nextgen-gallery/