365 more markets

Anyone understand 365's forecast and tricast returns since they have put those bets in more markets. Might be me being soft, but i think i hve been underpaid twice now. most recent example. 10p combination tricast singles - good karma, koroor, tootsie, dumfries paid 108.89, tricast was 1,187.28. Isn't that 119? did the same horses combination forecast 40p, got paid 81.30, forecast was 251.64, should that be 100 or thereabouts. Am i missing something, been doing these bets for donkeys and they always returned the fraction you had of the divedend