WP changing code on embedded Flickr slideshow

I have always been able to embed Flickr slideshows in posts using the Flickr embed code. However, now I’m running into a really strange problem. I paste the Flickr embed code in ‘text’ view, I’ll swap back to ‘visual’ view, and when I click back to ‘text’ view, the code has changed.

Also, now going back, all of my old posts have had the code switched. So, rather than allowing a user to click through the slideshow, clicking on the photo opens a link to the Flickr album in a new window.

Here’s an example of an older post where that’s happening. The photo used to be a perusable slideshow with the Flickr album name; now it just links to the Flickr album:
http://teamsterslocal727.org/2015/12/02/chicago-teamsters-strike-coca-cola-refreshments-over-unfair-labor-practices/

It appears that WP isn’t listening to the <script> portion of the code.

Here is the embed code when I first paste it into ‘text’ view:
<img src=”https://farm2.staticflickr.com/1548/25279671239_3abf65cbd1_z.jpg&#8221; width=”640″ height=”427″ alt=”Women's Committee Fourth Annual Gala Dinner Dance | Feb. 27, 2016″><script async src=”//embedr.flickr.com/assets/client-code.js” charset=”utf-8″></script>

This is what the embed code looks like after I switch to ‘visual’:
<img src=”https://farm2.staticflickr.com/1548/25279671239_3abf65cbd1_z.jpg&#8221; alt=”Women’s Committee Fourth Annual Gala Dinner Dance | Feb. 27, 2016″ width=”640″ height=”427″ /><script src=”//embedr.flickr.com/assets/client-code.js” async=”” charset=”utf-8″></script>

I’ve even tried using the embed shortcode, but I still run into the problem of it not being an actual slideshow and merely giving the first photo that links to the album on Flickr.

Any ideas?