RTP and house edge describe the long-run maths, not what a single session will...

https://josuesexpertblog.novacrestiq.com/posts/why-do-two-slots-with-the-same-rtp-feel-totally-different

RTP and house edge describe the long-run maths, not what a single session will return: a 96% RTP means a 4% house edge on average over many plays. Volatility describes how uneven results can be—smaller, more frequent wins or rarer, larger swings