They aren't showing up for me - just this:
Maybe it's my browser, not sure if it's happening to anyone else...
Then you've gotten lucky. Subwoofer performance can vary widely based on its placement within a room. Though it is a bit odd that a position that worked for one sub would be so bad...
It's very difficult (perhaps impossible) with any single sub to get good performance in all locations in a room. The sub crawl method that Sam mentioned can be used to find both the best placement for a single listening position, or the best overall compromise for multiple listening positions...