I dont know, whether or not you managed to solve this problem or not. But I also had the same problem, but I solved it another way, without changing the code.
I did it this way:
1. go to settings on the left and choose reading.
2. Then you should changes the number af “blog pages shown at most” to the desirret number of posts. Which in this case is equal to the number of produkts, you want to be displayed.
Hops it helps ??
