Refreshes the flash object is a child object in EF

When I save an existing object in my project, if I don't include it in the DbSet, it will lose its previous value. I can't figure out what's wrong with this project, I don't need to do this in my other projects.

Some codes:

var quoteRequest = _session.Set<QuoteRequest>()
                .Include(x => x.QuoteRequestInvites)
                .Include(x => x.QuoteRequestInvites.Select(y => y.SelectedService))
                .Include(x => x.QuoteRequestInvites.Select(y => y.SelectedService).Select(z => z.Service))
                .Include(x => x.QuoteRequestInvites.Select(y => y.Provider))
                .Include(x => x.District)
                .Include(x => x.City)
                .FirstOrDefault(x => x.Id == quoteRequestId);

if (quoteRequest == null)
    return Request.CreateResponse(HttpStatusCode.NotFound);

foreach (var invite in quoteRequest.QuoteRequestInvites)
{
    if (invite.Token == Guid.Empty)
    {
        _logger.Warn(invite, "Empty token changed for invite " + invite.Id);
                    invite.Token = Guid.NewGuid();
                    _session.Commit();
    }
}

_providerMailerService.ProcessInvites(quoteRequest);
_customerMailerService.ProcessNotification(quoteRequest);

_session.Attach(administrator);
quoteRequest.ApprovalDate = DateTime.UtcNow;
quoteRequest.ApprovedBy = administrator;
_session.Commit();

      

        
        
        
      

    

The problem is that there is somewhere in the project that we are missing and therefore we are losing data.