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

https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/

RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one session. Volatility describes how uneven results can be. In the short run, you can lose quickly or win briefly; results may differ sharply from the average.