If your exotic single race wager involves a runner that was scratched then your wager will receive a partial refund. Each possible 'combination' is viewed as an individual bet. You are refunded for all combinations including the scratched runner. The remaining combinations are still valid wagers that will result once the race is official
If part of your wager wins and the rest of your wager is refunded you will only see the win payout of the wager in your bet history. You will need to look at My Bets page to review the wager payout and refund amounts which are listed separately.
To get to My Bets you need to use the Account button in the top right then select My Bets from the drop down or go directly to https://www.tvg.com/my-bets
Please note that the same rules apply for some daily double and pick 3 wagers where the track declares a partial refund according to the rules of the wager.