I m thinking same...i think first the rank was zero and its one now so arrow is shown downward like if the rank was 1 in last week and in next week it is 2 then also arrow is shown downward .
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It goes ulta as the no increase arrow will be shown down. And as no decrease it shows upward. For example. If the rank was 4 last week n 3 this week the arrow shows upward as and in bracket it shows +1. In our case zero is less than 1 that's why it shows down arrow.
It's because maybe according to artificial intelligence, it has been programmed that the higher the better. Since zero is the highest (not in value, in the number system--it's the start) and 1 is next, these computers hv still not grasped Aryabhatta's concept ;)