Hi Ivy,
this kind of issues could be generated from various things.
I try with the most obvious: did you add your videos with the same URL syntax?

Just to be clear, you should add video with this kind of URL:
https://www.youtube.com/watch?v=ZpkH_s1Quck

Shorten URLs like https://youtu.be/ZpkH_s1Quck could not be work.

Try to create new posts instead of editing old ones.

99% of the cases, this should fix the issue.

Best,
Andrea

Hi Ivy,
I’m sorry but I can’t totally get it.
In a new post when adding a new URL, the video should be on the top of the page (header) and inside the post content. You can disable the video inside the post content by going in Appearance -> Customize -> Video Settings.

Here’s the page manual for further details
http://themes2go.xyz/manuals/vlogger/knowledge-base/2-9-video-settings/

What do you refer to when referring to “preview video”? Are you talking about the featured image? For this, if you are creating a new one (instead of importing with the Video Importer plugin) you should add it manually.

How to get the default featured image of a video? For YouTube you can use this simple tool. http://www.get-youtube-thumbnail.com/

Then, make sure to follow this video tutorial to add new post to your website: https://www.youtube.com/watch?v=ojzZXzAXDQs

Last but not least, deactivate all the unbundled plugins and test again: From your source code I see there is a third party plugin that could interfere with the theme. It should be this: https://wordpress.org/plugins/content-views-query-and-display-post-page/

Thanks,
Andrea

• This reply was modified 5 years, 3 months ago by themes2go.