Ideal Image interview questions

Decent interview. Many questions about experience and ideas for the future. I was offered the job on the spot and was told I would receive a formal offer in a couple of days. I did receive an offer and the details were largely incomplete. I ask for some clarification and never received any response. I followed up over the next 4 weeks and nobody would respond. Finally sent an email about a month into this and then I was informed that they were cancelling the position altogether. So I was offered a job and when I asked for details, they ghosted me. By far, the single strangest, unprofessional experience I have ever experienced in interviewing.