When I select the key why does the stat value not read .5 0

This has been bugging me for days and if I select the key at 1 it reads 24 -70. It appears the frames are being displayed with some kind of relation to 24 fps since 1 on the slider is 24 but I have no idea why. If I enter .5 0 on the key it puts it just a hair past the 0 0 key. I can obviously work around this issue by tweaking the values but it makes it difficult when I want to work directly with the numbers.