I have been seeing this comment not showing issue for a long time and I have noticed it. But I thought it might be a problem only in my mobile. So after you said it today I realized that it might be happening to everyone. Which is not only seen on steemit.com.

I knew the first thing. That's why I told about it. But the issue of the video not showing on steemit.com is being worked on by our respected developer @alejos7ven. Hopefully he will bring it up in a very short time and he will tell you about it in detail. I have asked him to tell you this in detail. Thanks.