Is it also right that they can be suspicious just by looking at the application and papers/documents we have included or not included and based on that call us in for separate interview right away compared to as if it didnt look suspicious and would interview us only together?
Probably they will interview you together and then if they are suspicious may schedule another time to interview you alone. If you think that there are problems with your application you should speak with an attorney soon. You can bring more supporting evidence to the interview if you did send enough with your application.
anyone who comes to me only for an interview pays a premium for my time. I presume there is an issue that needs my review.