Adaptive views work in local preview, but break on Axure Cloud

Hello-
There must be something that I am just plain missing because this seems too weird. I’ve got an adaptive viewport that I’ve built to have base and desktop (1280 wide) breakpoints. If I preview them, everything works and looks fine. But if I publish the viewport to Axure Cloud (or publish it locally), suddenly the base view becomes 1330 wide and it no longer adaptive follows the adaptive breakpoints that existed for preview. I’m attaching the .rp file in case this helps.
Thanks in advance for any assistance.

for_axure_upload_02.rp (126.0 KB)

-adam

I’m still hoping someone out there might have some insight into this issue. Any assistance is greatly appreciated.