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why EF tries to add new record instead of edit?
var currentUser = (from i in _dbContext.Users
                           where i.FirstName == user.FirstName && i.LastName == user.LastName
                               && i.Title == user.Title && i.Company == user.Company
                           select i).FirstOrDefault();

                        currentUser.Company = user.Company;
                        currentUser.CompanyUrl = user.CompanyUrl;
                        currentUser.Country = user.Country;

                        _dbContext.SaveChanges();

currentUser.Company = user.Company;

var currentUser = ...;

var company = new Company { Id = user.Company.Id };
_dbContext.Companies.Attach(company);

currentUser.Company = company;
...

_dbContext.SaveChanges();