Bug: Dynamic pricing broken in NT Bundle (S)

This bundle includes:

1.  Studies in the New Testament ($26.95)
2. Critical Questions for New Testament Study ($17.95)
3. Life in the Face of Death: The Resurrection Message of the New Testament ($28.95)
4. Exploring the New Testament, vol. 1: Gospel and Acts, new ed. ($24.95)
5. Exploring the New Testament, vol. 2: Letters and Revelation, new ($24.95)
6. The Grace New Testament Commentary (2 vols.) ($39.95)
7. Introduction to the New Testament ($2.95)
8. Introduction to the New Testament ($2.95)
9. The New Testament: Its Background and Message ($25.95)
10. New Testament Exegesis and Research: A Guide for Seminarians ($10.95)

The total individual cost of this bundle is $206.50. I own everything apart from Critical Questions ($17.95). I should therefore get a discount of 87% on the purchase price of $44.95.

That is, my price should be $3.91, whereas in fact I'm being asked for $13.87, which is barely any less than buying the individual volume on its own.