Supply Chain Wizard interview questions

The interview's difficulty is avarage, they asked general questions to get to know me and basic technical questions to measure my knowledge. Part of the interview was conducted in English.The next day, they called to invite me to the tecnical interview for next step and we set an interview for three days later. Ten minutes later of our phone call, they called me again and said "The decision has been taken to close this position, sorry". I couldn't understand what changed in 10 minutes. Instead of rejecton in a professional language, they set the next interview as if it was positive and then canceled it like this. They have a really unprofessional human resources.

I had 4 interviews in total. All of them have their own difficulties but analyzing a study case and presenting it was the most difficult one for me. However, I think it was the most beneficial step for me and for the company to get to know me better. Everyone was so great, always supporting me when I answer wrong, I've seen that in their eyes.