Hello and welcome.

Are you subtracting fiber counts or no?

My first thought is, are you sure the units are the same? I just looked the tahini up on Fitday. The 21 g per 100 g sounds about right, and the 1.9 looks like a 1 Tbsp serving.

For the chia seeds, the fiber information was missing. I googled around and did the math backwards from the calorie counts, and it looks like the correct info for 100 g chia seeds is 472 calories, 26 g fat, 48 g total carb, 34 g fiber, 17 g protein. I didn't double-check it, though, so maybe someone else can correct me if I'm wrong.

HTH.