Web API Recently Played Tracks Latency

[jsinme]

I'm trying to interface with the api to get recently played tracks and in my testing I'm having a strange issue where I get a valid response but am missing the most recently played tracked.
I know they are being tracked because I can see them in the mobile app listening history, they're just not being returned by the api.
Does anyone know if there is some built in latency to the api or cacheing of responses that may be causing this?