US ma afno vanne daju bahini bahek re, bahini swutkeri re, dewar chai birseko moro, ki bahini single mom huna lageki? ma pani single dad he he, narisau hai jiskeko. must be the reason is that you had a pending asylum as most of your family is here and they don't want any more here as already dealing with 50-60 thousands illegal children from Honduras, Guatemala and El Salvador, they might thought your parent will stay here forever, since rest of your family members are here, tell them to file a refugee status, might work

You application for asylum must be the likely reason. Why would they risk two more asylum applicaiton? I think you can forget about bringing your folks here...

Bond
It is more likely that your asylum application costs your parent's visa.

http://www.asylumist.com/2014/04/18/family-members-of-asylum-seekers-beware/
Not only this I even read somewhere that family of one who flee with credit card debt have hard times getting non-immigrant visa.