What is the ruling on re-performing the Fajr and Dhuhr prayers for the previous day upon discovering a wet dream after the 'Asr prayer and performing ghusl, and only performing the 'Asr prayer on the first day, then re-performing the Fajr prayer on the following day, and at the time of the Dhuhr prayer re-performing the Dhuhr prayer?

It was obligatory upon you to make up all the prayers you performed while in a state of janabah (definition) immediately, in their proper order, after performing ghusl (definition). You should not have delayed them until their time on the following day, due to the Prophet's (peace be upon him) saying: "Whoever forgets a prayer, let him pray it when he remembers it; there is no expiation for it except that." Delaying the make-up prayer until the next day is not permissible. We hope you will not be held accountable for the delay as long as you were unaware of the ruling.