The reason they may be doing this is they are showing dietary fat being burned, not your fat. The best thing to do is test first thing in the morning before you have eaten. Changes later in the day may reflect diet, not ketosis.

I found some at walmart in the diabetics section. They were the same price as the metabostix, but contained 50 n ot 25. If they slap a "diet" aid lable on things they can auto charge twice as much or more these days :P