Masculine forms change with number and case. The two plural rows are two valid sets.
Number / set Nominative Accusative Genitive
Singular ذُو ذَا ذِي
Dual ذَوَا ذَوَيْ ذَوَيْ
Plural, first set ذَوُو ذَوِي ذَوِي
Plural, second set أُولُو أُولِي أُولِي