Hello Rudy, others!
Indeed, this is a new feature that shows "position change" during last 2 weeks.
Right now its only change during last 2 days (just started collecting this data), but soon it will be "position change during last 2 weeks".
Blue arrow up and number means that this station position improved compared to what it was 2 weeks ago.
From the sample picture: UB9USV position improved by 8 places
Red (actually pink) arrow down and number means that position got worse during last 2 weeks.
From the sample picture: UR5LP position dropped by 1 place.
If there is no red/blue - it means the station is exactly on same position where it was 2 weeks ago.
On station 'home page' its the position among ALL hunters (including those who applied for award and those who didnt)
On 'Award owners' tab there is a similar thing, but (as name suggests) - only those stations who have applied for award are participating.
Here: SM4IED position improved by 2 places, JA8MS dropped by one place.