Paging of products when using facets is wrong

When you go here the pagination shows 6 links in the paging. http://www.demo.onehippo.com/products/Product+Category/Solar

The number of pages does not match the actual results. After page 4 no resuls show up. I suspect that the calculation of the number of pages is wrong, or not correctly applied to the pagination markup.

http://www.demo.onehippo.com/products/Product+Category/Solar?query=&pageNumber=4