Slider images appear truncated in IOS vs. PC

[Chrisj]

I installed a javascript slider and added my images, but my images apparently have a sizing issue, I can see more width of the image on my pc screen, but on an iphone the image seems almost cut in half. 

Any ideas how to remedy will be appreciated. Here's some relevant code:

html, body, .container {
	height: 100%;
}

.js .boxgallery,
.js .boxgallery div {
	position: absolute;
}

.js .boxgallery,
.bg-tile,
.bg-img {
	overflow: hidden;
}

.js .boxgallery,
.js .panel {
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}

.panel {
	z-index: 0;
	-webkit-perspective: 1200px;
	perspective: 1200px;
}

.bg-tile {
	width: 50%;
	height: 50%;
}

.bg-tile:nth-child(2),
.bg-tile:nth-child(4) {
	left: 50%;
}

.bg-tile:nth-child(3),
.bg-tile:nth-child(4) {
	top: 50%;
}

.bg-img {
	width: 100%;
	height: 100%;
	background: #999;
}

.bg-img img {
	position: absolute;
	display: block;
	height: 200%;
}

@media screen and (min-aspect-ratio: 1280/850) {
	.bg-img img {
		width: 200%;
		height: auto;
	}
}

.bg-tile:nth-child(2) .bg-img img,
.bg-tile:nth-child(4) .bg-img img {
	left: -100%;
}

.bg-tile:nth-child(3) .bg-img img,
.bg-tile:nth-child(4) .bg-img img {
	top: -100%;
}

Any help will be appreciated.