Job market & recruiter

Hi everyone recently i have went interview with eclerx for there client as goldmansachs [soft dev role] i was fine as they are giving decent hike on current . After clearing interview she asked me to give every document to release the offer.I was ok and then she started asking every document from joining bonus credit to each sem marks along with my name in that and residential proof or what not. I was little resistive but still gave it as she was mentioning its bank and compliance. Today she mentioned she will release the offer knowingly i have to join the other org tomorrow. Now after reaching out couple of time she called back saying i had a call with super boss since pay is high i need to take one more client round. I see the email she used was correct and the profile of both hr were fine on linkedin but the way she behaved while expediting on document part and later saying its ok if you don’t want to join. I smell something cooking. Did this happened to you ? What do you think assuming supply of candidates are they preparing some database. Also what are the red flags you have seen these days