listTotal wrong in custom product list with group by

[TempleClause]

For some reason my list total is not correct anymore after adding a group by clause. 

I copied and modified the product list page. Because the list total is not correct anymore, paging also doesn't work anymore. 

Odd thin is I added a group by in a custom order list where it works like a charm.

Any ideas? If not, can somebody at least point out how to disable paging completley? 

 

Thanks