'Plotly graph doesn't save on WordPress

I am trying to embed the graph I have here in my WordPress blog but am unable to view it once I refresh the page.

I am pasting the iframe HTML of the graph in the Custom HTML block in WordPress. When I click on Preview I am able to view the graph. But even after saving the edits in the draft, once I refresh the page, the graph is lost and I end up with a blank Custom HTML block.

This the iframe HTML I get from chart studio after clicking on Embed Code > iframe:

<iframe width="900" height="800" frameborder="0" scrolling="no" src="//plotly.com/~sly.of.zero/19.embed"></iframe>

How can this be fixed so that the graph stays saved in the blog?

wordpress plotly

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'Plotly graph doesn't save on WordPress

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