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

https://abigailsimpressivechat.yousher.com/variance-vs-volatility-in-slots-are-they-the-same-thing

RTP is a long-run average, not a promise for one session: 96% RTP means a 4% house edge over time. Volatility shapes how wins and losses may be spaced. In the short run, results can swing widely, so you can lose more than the average suggests.