Meta Data Scientist interview questions

After speaking with a recruiter, I had a 45 minute technical screen with a data scientist with a few SQL/product questions. After the screen, the recruiter sends you tons of documentation about the onsite and gives you a few weeks to prepare - the documentation is fantastic and gives a great sense of the kinds of questions you'll get. Onsite consisted of 5 interviews + an hour lunch with a data scientist. The process is very well organized and structured and my recruiter was great at keeping in constant communication with me throughout the process.

I applied online, and then HR contact me within a week. Got the technical phone interview. asked one SQL and a few business question. All the questions are very simple. In the end, the HR told me the feedback that I need to improve technical skill. This is not I expected result.