Citizenship

After doing my first N-400 interview December 3, 2019. IO said I passed the civics test but no decision could be made. I got a notice that on 09/18 an interview was scheduled again. This is very confusing. In my first interview the paternity of my daughter came up, my wife had an affair and she is not my biological child hence me listing her as step child in the application the IO asked if I stayed in the home I said yes we never separated and we worked it out. That was the only thing he seem to have taken issue with. Now he wants me back for another interview it’s been almost a year since my first interview