Using a script with variable height

I am using Hot Destinations on a Garden Machinery website and am trying to use a third party script to display exploded parts diagrams. This works fine until the diagram and parts list is displayed. At this point the lower modules (footer, adverts etc.) display over the top of the parts list.
Please see www.hampshire-garden-machinery.co.uk/ser...er/diagram/106309863
I currently have the script in a custom html module in toolbar position, but have also tried it embedded in an article displayed in the inset position with the same result.
I could stop the offending modules from being displayed on that page, but would prefer not to.
I have just checked the above link and it displays correctly when you go straight there, so the only way to see it going wrong is to got to services/parts, then select a brand (in this case husqvarna), then select battery mowers, then select a diagram number while hovering over automower.
Something else I have just noticed is that when it displays incorrectly, if I press F5 it then displays perfectly. It is obviously something to do with having a dynamic height.
Although this is not an error with your template it would be very much appreciated if you could help me with this.
Kind regards,
Ian

You need to allow script tag in editor plugin settings.

Yes, I have already allowed scripts - It didn't work at all before I allowed it.

I think you can find module that allows javascrit input, check this list:

extensions.joomla.org/extensions/core-en...stom-code-in-modules