<img> tag does not seem to work

I have the following issue. When I add this to the editor the `` tag does not seem to work, no problems with `` and other tags.
```
++some fractal++

Embedded in MD as
``
the picture is ok:

Embedded as `<img>` tag, it does not seem to work. Included in the MD text is:
`<img width="500" src="https://i.imgur.com/rK5t5LP.png"/>`
It displays like:

<img width="500" src="https://i.imgur.com/rK5t5LP.png"/>

In the debugging inspector it renders like:
`<p><img <a="" href="http://src=&quot;https://i.imgur.com" width="500">src="https://i.imgur.com/rK5t5LP.png"/&gt;</p>`
<br>
In iframe it's ok (at least when you leave it between empty lines)
`<iframe src="https://i.imgur.com/rK5t5LP.png"`

and link also works
[Fractal](https://i.imgur.com/rK5t5LP.png)


What is wrong with the `img` tag??
```
When added to this github editor it all works fine (except `iframe`):
++some fractal++

Embedded in MD as
``
the picture is ok:

Embedded as `` tag, it does not seem to work. Included in the MD text is:
``
It displays like:

In the debugging inspector it renders like:
`

src="https://i.imgur.com/rK5t5LP.png"/>

`


In iframe it's ok (at least when you leave it between empty lines)
``

<iframe width="700" src="https://i.imgur.com/rK5t5LP.png">

and link also works
[Fractal](https://i.imgur.com/rK5t5LP.png)


What is wrong with the `img` tag??