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I have cloned your form and I could see the same, first I though it was an issue, but after checking the settings I found you are using your form in encrypted mode.
I have changed it to No and then I was able to display the Full Name properly in the Thank You Page.
So you are getting the encrypted result in the Thank You Page, that is not really an issue, since if you try to access to submitted data without providing the Key, it will be displayed as the way you are seeing currently in your Thank You Page, also there is no way to post answers on Thank You Page using the encryption feature, if you want to show answers on it, you will need to disable the encryption.
Hope this helps.