images disappear after 2-3 seconds in MS IE 11 on pages w/animation

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Using WordPress 4.6.1. (I don’t think this problem occurred w/previous version’s of WordPress.) Using a child theme of Sensible WP (free version). Using Windows 8.1 64-bit. This problem is that the TOP COUPLE IMAGES on the page disappear after 2-3 seconds (maybe after the page fully loads(?) ONLY when these 2 factors occur:

1. using MS IE 11. (All images diesplay correctly in Chrome, Firefox, Opera, Safari), AND
2. the web page includes an animation class.

To demonstrate the problem, I added this animation class to the <h1> element:
<h1 class="animated fadeIn delay">

The top 2 images disappear after 2-3 seconds on this page: http://tinyurl.com/zp7mbxk

Things that I’ve tried so far are: disabled all plugins, validated my CSS code, set “Compatibility Mode” in MS IE Tools – Options, added the IE-Edge meta-tag in the page -head- section.

I’d appreciate all suggestions. Thank you.