I haven't seen it yet here in Oz, but it doesn't surprise me.

I find they do lots of tests like that where they change too many variables or simply the wrong ones (like this one).

No wonder they get so many messages "on the website"

As an engineer and someone looking for real scientific tests, the whole concept of the show is waning on me when they do stuff like this. That said, this is just obviously wrong from what you've said.