Environmental Defense Fund Business Development interview questions

Interview at the office with boss. The interview itself was fine/average, but the position expectations were completely different from what we discussed during the interview. The oddest thing was that my boss offered me the position a few days later over the phone and then subsequently I had another interview with senior management, which made me feel like the offer wasn't solid. I ultimately got the position but was unhappy with the job responsibilities not matching the interview discussion and ultimately left the organization.