[Plugin: AnythingSlider for WordPress] Alternate slides with videos collapse in IE

I’m working on a site with several sliders using videos – some locally hosted MP4s, some YouTube embeds. The MP4 pages work fine, but…

On this page: https://staff.hsl.wisc.edu/rdsTest/?page_id=3414 there are 4 slides. The first and third slides display fine, but the second and fourth cause the entire slideshow to collapse horizontally to almost nothing. I can’t find anything very different about the 2 working vs. the 2 non-working slides. Any ideas?

The page is a mess, I know (lots of hacking done to lots of sections of the site and I’m not the world’s best developer) but its the some slides work, some slides don’t that’s really perplexing me. If you look at it in any other browser you’ll see how it should look (non-collapsing, height consistent across slides).

https://www.ads-software.com/extend/plugins/anythingslider-for-wordpress/