prices

hi i want to book 8 adults on a ryanair flight to girona in may it£28 going and coming back £39 thats the price if i book 2 or 3 flights
but if i try to book all 8 flights it goes up £10 per pearson on the return flight ????? has anyone had the same problem

thanks

yes i see price changes on 1 person or 3 sometimes, i have in the past bought 3 seperate flights because its cheaper than booking 1 for 3 people.