Hi @preeti5,
Your query is not clear. As per my understanding, when you are opening the page properties, it shows blank for a page but other pages works fine, right?
If yes, pls check the sling:resourceType of the page or get the cq:template and from template check the page component (which will ideally be under /apps/your-project).
Check the dialog values of the identified page - if there are any issues in the xml or page itself.
Hope this help!
Thanks,
Kiran Vedantam.