NextGen Healthcare Senior Staff Software Engineer interview questions

This position was for Senior Staff Engineer iOS, I attended a total of 6 rounds of interview for this position and I had gone to their office 3 times. After all these interviews they told me to give the documents and they will release the offer soon. But later they didn't reply only, after a couple of follow up emails they replied to me saying that this position is on hold. The technical rounds were easy and the technical guys were good too. The HR Partner who took my interview had too much attitude.