Being on the fence is a good potential explanation. It could also be a quasi team selection thing. This is for a non technical role, but another team where I work put someone through all the normal rounds and then didn’t give them an offer but asked me if I wanted them on my team. Well, I wasn’t privy to that process so I need my own “round” and now this person has got an extra interview and it probably looks weird or bad for everyone but I ended up making her an offer and she accepted.