Ok I am new to online betting just a year $5-10 here and there. I mostly do parlays. Below is the $10 bet I made for a 4 game parlay. Seattle won by 3 so I thought I lost the parlay. But instead I won but won half of what the original payout was. The last line of course is the team I bet on with the spread/odds. I am thinking that since the spread was 3 for the Seahawks/Bengels game and since they won by 3 it cancels out that bet? Is that how it works?

Parlay (4 Teams) 09/17/07 22:38 ET
bet 10.00 to win 132.64 (paid 70.0) Result: Wager Won

Bengals(Cincinnati) 21
Seahawks(Seattle) 24 09/23/07(16:10 ET)
Bengals(Cincinnati) +3 (+105)

Cardinals(Arizona) 23
Ravens(Baltimore) 26 09/23/07(13:05 ET)
Cardinals(Arizona) +7.5

Cowboys(Dallas) 34
Bears(Chicago) 10 09/23/07(20:30 ET)
Cowboys(Dallas) +3

Panthers(Carolina) 27
Falcons(Atlanta) 20 09/23/07(16:20 ET)
Panthers(Carolina) -4

in a parlay bet, when one of the bets results in a push only that bet is canceled. the remaining bets in the parlay still count. that is the reason you won the parlay but at a lower payoff. instead of it being a 4 team parlay, the Bengals push turned it into a 3 team parlay

Yes...the spread for the Bengal game was +3. Adding that to the final score gave the Begal 24...which 'pushes' against the Seahawks 24. Therefore that bet would end with a 0 payout.

You are correct in your thinking.