indesign eliminates pages of the document

Hello,

I'm working on designing a book. I have placed the text in the indesign document. I created a body paragraph style and tried applying it to the whole document. Here is the problem: before I apply the style, the content of the whole book is in the indesign document (let's say at page 142). After I apply the style, there is nothing past page 142 and the rest of the document disappears. Has anyone had this experience and how did you fix it? 

Thank you for your help.