A slight issue when <iframe>ing circuitjs.html

[SirClickALot]

I have been experimenting embedding circuit models within an third-party-generated web page.

I do this all the time with other embedded web pages without issue but when it comes to embedding something like this...

<iframe width="100%" height= "100%" src="/assets/apps/electronics/circuitjs.html?hideInfoBox=true&hideMenu=true&hideSidebar=true&running=true&startCircuitLink=/assets/apps/electronics/_circuits/ram-dynamic.txt"></iframe>

When viewing the parent page, at first the model does not appear and I have to right-click on where I know the <iframe> to be and choose 'Reload frame'.

Does anyone have any experience with this and/or any ideas as to what I can try to fix it?

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THIS IS ONLY A PROBLEM in CHROME, Firefox works a treat!
PLUS, if I have the Inspector open in Chrome then that's OK too the <iframe> displays fine.

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Here's a screenshot add clarity...

Here is the actual URL: https://sirclickalot.co.uk/assets/books/gcse-computer-science-plus/chapters/computer-systems-in-detail/topics/cpu-in-detail/explainers/cpu-digging-deeper-ram-dynamic_problematic/#xl_xr_page_circuitjs_model

The 'invisible' <iframe> is on the right hand side.

Thank you