Posts are not loading in popup anymore

You do have some console errors with lazySizes.

This API route should be showing your content: https://www.alternativeenergywa.com.au/wp-json/wp-post-modal/v1/any-post-type?slug=analysis-of-real-time-data

Since it’s not, you have two courses of action:

1) Figure out why that route is not showing
2) Turn off the REST method in plugin settings

Thanks a lot,
I have forgotten to update this thread.
Action 2/ worked well!