What are the reasons behind the Chinese consulate asking for more documentation for a tourist visa? [closed]

My partner and I are applying for tourist visas to visit China. He is US-born, US ancestry, etc. and his application was approved within a day.

Meanwhile, I’m having the toughest time with my application. We’re working with an agency, and they’ve come back to me every other day stating the Chinese consulate needs more documentation from me. I was born in the US. My father was also born in the US to Chinese parents, and my mother is a naturalized US citizen (born in China). Since my partner’s application was approved so quickly, I doubt it has anything to do with our trip in question. Is it more about my nationality? What is tripping them up?