Let's look at this example booster:
Transaction Type: Offer
Boosting Percentage: 65%
Duration: 13 Hours
Imagine this booster is currently active, so it gives you a 65% increase on your offer earnings. You complete an offer that usually credits you with 1,000 points. When the booster is active, you receive a transaction of the type Offer with an amount of 1,000 points. Just as usual. And on top of that, you receive a transaction of the type Booster with an amount of 650 points.
That's how boosters work. They create a second transaction of the type Booster that has an amount based on the initial transaction and the boosting percentage.