The content is still there as far as I can see, it’s just not integrated into the page in the frontend. Since you are using Elementor as PageBuilder, it is probably related to this. If you deactivate it, you will probably only see strange codes – this is the case with content that you enter via this PageBuilder and then deactivate Elementor.
If you have a backup of your project, you could use that to restore it. Otherwise I would recommend you to contact the support forum of Elementor: https://www.ads-software.com/support/plugin/elementor/
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