See the Vatican version here:
6 qui reddet unicuique secundum opera eius:
7 his quidem, qui secundum patientiam boni operis gloriam et honorem et incorruptionem quaerunt, vitam aeternam;
8 his autem, qui ex contentione et non oboediunt veritati, oboediunt autem iniquitati, ira et indignatio.
It seems understandable that in verse 7 vitam aeternam is accusative because it acts like the object of reddet; but why is ira et indignatio not in the accusative?