Chunk Demolition

I hope I'm the only one with this problem, because this is truly devastating...  My family and I play together in a private sever (Set up on a desktop computer). When  we hoped into the server, these two locations where completely gone, we couldn't even walk over it like it wasn't rendered. This destroyed half of my father's house, and a open piece of plains. These are the only two locations I could find. Thank you for your time and interest