When placing bets on an Asian handicap (+-X.25 or +-X.75 bets) then the stake is divided between the two closest ½ intervals.
For example, if you place a +-0.25 Asian handicap bet, half of the stake is placed on +-0 handicap, and the other half on +-0.5 handicap.
If you place a -0.25 Asian handicap bet on Team 1, it means that the team has to win by the margin of 1 goal for your bet to win. If the result is a draw, then this bet/leg is calculated with odds of 0.5. If the team loses, then your bet loses as well.
If you place a -0.75 Asian handicap bet on Team 1, it means that half of the stake is placed on -0.5 handicap, and the other half is placed on -1 handicap. Therefore, to win the whole bet Team 1 has to win by the margin of at least 2 goals. If Team 1 wins by 1 goal, then half of the bet is won and the other half of the bet is returned.
If you place a +1.25 Asian handicap bet on Team 1, it means that half of the stake is placed on 1+ handicap and the other half is placed on +1.5 handicap. Therefore, if Team 2 wins by 1 goal, then half of your bet wins and you get half of the stake back. If Team 2 wins by 2 goals, then your bet loses. In case Team 1 wins or the final result is a draw, your bet wins.