Facebook Instant article Issue

I’ve been using IA for a while now. Today morning I open couple of articles on the mobile (facebook app) and all of them are showing empty. Just showing the title, the featured image and related articles. I went over to IA config section on the PC and I can see the complete code. everything looks perfect, just that articles appear empty on the FB app (even in the page manager app).

Anyone have any idea whats going on?