Confluent Salary Structure and stocks

Anyone aware of confluent salary structure and stocks. I recently got an invite for an interview for the position of senior security engineer. The base seems promising but stocks seems to be pretty low. I was informed that the stocks would be 30% of annual CTC vested over 2 years. But the HR was unclear about stocks. She also mentioned 30% stocks is annual value and will get refresher at year end. Kind of very confusing. If anyone from confluent can help here to make it more clear for me.