Google Analytics product performance report shows very high Cart-to-Detail and Buy-to-Detail Rates over 1000%

[zin]

In my GA product performance report the Cart-to-Detail and Buy-to-Detail Rates range between 0 and 5000%. I don't understand why these numbers are in such large ranges. Can anyone help me with an explanation how such high numbers occur? I'd say the majority of the products are in three digits range. I think this is wrong.

The conversion rate is about 3%.
The overall cart-to-detail rate is 20% and buy-to-detail is 3,3%.

Thanks

Zin