RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one...

https://www.pure-bookmark.win/rtp-is-a-long-run-average-house-edge-is-the-casino-s-expected-share-96-rtp

RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one session. Volatility affects the size and frequency of swings. Short-run results can vary sharply, so you may lose more than expected.