WordPress Demo Importer fix

I have a demo importer on my WordPress site, and everything runs well. The issue is that on some of the demo pages that are imported, the page does not show up as it should. All elements are added to a single text element, and the design is not the same. I have attached 2 images.

I need someone to fix the issue with my demo importer. Please do not bid without having experience in WordPress importers.