Is it obligatory to repeat the fasting, knowing that a death accident occurred to two brothers, and that the questioner fasted two consecutive months twice after a previous fatwa, then it became clear to him that he was suffering from impure discharges after urinating and did not know the obligation of removing them, and he is now making up the prayers?

It appears that the fluid discharged after urination is "wady" (a thick, white, cloudy fluid that is discharged after urination or during excessive fatigue). It is impure (najis) and necessitates ablution (wudu'). The emission of wady does not invalidate the fast, by scholarly consensus, so your fast is valid. As for the prayers, if you did not perform ablution after the emission of wady, then your prayers are invalid and you must repeat them according to the majority of scholars. You should make up for the delayed prayers as much as you are able, provided it does not harm your body or livelihood. The Malikis permit making up two days' worth of prayers with each day.