The 87.5% RTP for Corrida de Toros is a venue figure, not a promise. It is the long-run average return across an enormous number of spins, and it says nothing about the next spin or the next hour. A medium volatility pokie like this one spreads results across a moderate range, so a session can sit above or below that average for a long time before it drifts back.
The minimum bet is A$0.01 and there are 25 paylines, which matters because stakes are what turn an RTP into an actual dollar figure. At the minimum on all lines, the exposure per spin is small in absolute terms, but the percentage is the same. The house edge sits in the gap between 87.5% and 100%, and it applies to turnover, not to your starting balance.