Looks Good When Scrolling Up But Not Down

Hey,

It seems to be working great except there it is sticking to high when scrolling down. It is great when scrolling up just not down.

http://dogsnatu.staging.wpengine.com/dog/nutrition/raw/

Any thoughts?

Here is a screenshot to my settings: https://gyazo.com/fd289a4af474a9f1ff194b3e0cac83d8