Why were we rejected under 214b? USA

I have an Indian passport

I was planning on travelling to the USA to visit Orlando Florida with my family

• I have a mortgage on my house
• I have permanent residency in the UK
• I have a job where I've been working for over 14 years
• My husband and two boys were travelling under ESTA's and have British passports
• My children are going to go to good universities and living at home while doing so
• I had bank statements with me
• We bought the tickets, and had proof of return flight tickets, hotel tickets and insurance

I had evidence of everything.

The first time I had the interview I was rejected because I didn't have the airline tickets and I didn't show my bank statements, and I believe their was a lack of communication. I managed to get another appointment within 1 and a half weeks, as I kept checking for cancellations as we wanted to go on this holiday really badly.

I managed to get another interview, I got to the interview, everything was fine until I was asked how I got another appointment so fast.

she (Interviewer) said: 'you can only get one after 6 months'

I said (Me): 'I phoned up the US embassy to ask how we could get an earlier appointment and they told me to keep checking for cancellations and that's how we managed to get an earlier appointment'.

She said (Interviewer): 'Is this an emergency, is that how you got the appointment.'

I said 'No, we managed to get one by checking every hour online for cancellations.'

The interviewer looked around for someone, I don't know who she was looking for and said 'Sorry you have been refused.'

I said 'Why have I been refused, I've got all these documents.'

She said 'It's on the paper mam, please could you go other people are waiting.'

I then left, the paper said nothing specific about the refusal, it just said we were rejected under 214b.

What happened, gutted that we've had to cancel this holiday ?

Could it have been that I've never been anywhere else other than India? (I live in the UK)

Additional info - I should add she also asked 'How I got this visa appointment so early as her first question, but she brushed that question off initially and went onto the next ones. It's like she got panicky towards the end and thought that I had done something wrong to get this appointment.