RTP and hit frequency have different meanings. Some slot machines have a lesser win frequency, but higher payouts, and some have higher chances of winning, but the prizes are usually of a lesser amount. Both can have an RTP of 97%, but one can have a win frequency of 8% while another can have 3%. For a player, it may feel that he is winning more often with a high win frequency, albeit small ones, but in reality, the chances of winning the 97% RTP is the same.