Video Caching

Hi, I have a page on my website with several embedded Vimeo videos one after the other. If I navigate to another webpage, then go back, all the videos on the page are replaced with the last one. If I refresh the page, the problem resolves itself.

I created a new test page and embedded several YouTube videos. The same thing happened. I am using the Sydney WordPress theme.

I deactivated all my plugins. Several of them are performance plugins and I emptied their caches, but this did not resolve the problem.

Any suggestions as to what is happening would be greatly appreciated. Thanks!