The board is 9c9d6h, BTN vs BB SRP. The solver suggests checking all BDFD A2-A5 but suggests a relatively high frequency of betting when holding As2s-As5s. (For A4s: Ad4d, Ac4c and Ah4h are 100% check, As4s has around 30% betting frequency)

Looking at the opponent's response to our c-bet, it seems like As2s-As5s block more opponent's folding range. Why does solver suggest checking more A2-A5 BDFD on this board?