As we see videos works properly. So we really don't understand the problem. And the iframes we see are related with youtube service, not with our styles. Videos are styled by youtube only and we have nothing to this case.
Ohh ok, we missed that. They won't work because you must upload images for them. Sliders are not compatible with videos and that's why for sliders must be used images. So on slider you have an image but on single post you will have video. This is how slider works.
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what is your website? Please provide url so we can have a look on it.