reachInfinity triggered at slightest scroll wheel change

[umdstu]

Behavior:
reachInfinity triggers the request for the second page once you near the end of the list. Any scrolling (even a hair) after the 2nd page is loaded seems to be trigger a reachInfinity call.

Expected:
reachInfinity triggers when it is near the end of the list for every page.

Doesn't seem to do this all the time, very odd. Anything I may be doing incorrectly to cause this?