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

https://www.last-bookmarks.win/rtp-is-a-long-run-average-return-96-rtp-means-a-4-house-edge-over-time-not

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