i have done several bets, so it might be that you fee one bet with this adress (how did you search - the search only allows searching for the Transaction ID?)
1. Go to
https://www.betcoin.tm/dice/2. On the left hand side, there is a field "Enter Your Bitcoin Wallet Address".
3. Enter your address (in this case, 12pMntz8ZTNoGRUAYVALVVXFE8G52uPziA), and click "Add This Address to My Games" just below the field.
4. You should see two bets (the first result should be the bet in question)
But the TX is showing no bet in there system.
I couldn't find it using the Tx ID as well. Sounds like a bug to me.