I'm happy to report that our developers have released a fix today that should resolve this issue. Your WebApp calendar is dependent on your device timezone, and should now match your Mobile calendars accordingly.
If you don't see any improvement upon logging in, the fix may require clearing your browser's cache in order to take affect. You can find instructions for how to do this with a few of the most popular browsers here.
Thanks again for your patience while we worked through this together! I hope you'll now enjoy an improved Rachio WebApp experience