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

https://www.sierrabookmarking.win/rtp-is-a-long-run-average-the-house-edge-is-the-casino-s-mathematical

RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one session. Volatility shapes how often wins land and how large they may be. Short-run results can swing sharply, so you can lose more than expected.