RTP is a long-run average: 96% RTP means a 4% house edge, not a promised return...

https://penelopesultimateblogs.hexaforgey.com/posts/how-is-casino-volatility-similar-to-portfolio-risk

RTP is a long-run average: 96% RTP means a 4% house edge, not a promised return in your session. Volatility affects how often and how much wins land. Short-run results can swing widely, so you may win or lose more than the average suggests.