Microsoft today released yet another cumulative update for Windows 10 Mobile devices on the Release Preview and Slow rings. The build number is 14393.103, and you're not crazy. It's the exact same number as the one released to Insiders on August 25.
At the moment, we have no way of knowing exactly what's new in this update, as their has been no changelog posted by Microsoft (as usual). Perhaps most interesting is that the company said that there would be no Insider builds until next week, although that was referring to Development Branch builds. Moreover, while it upgrades its services, you won't even be able to set up a new PC for the Insider Program and download a build.
The Production ring build for Windows 10 Mobile is still 14393.67, which wasn't even ever released to PCs, and there is no record of it in the Windows 10 Update history. On the other hand, 14393.82, which was released for PCs, contains notes that include Windows 10 Mobile, even though the Production ring never saw it.
We'll keep you updated if and when we find more about today's update. It's entirely likely that Windows phones will receive this update on Tuesday, as that's typically when cumulative updates are released to the public.
Update: Despite being called 14393.103 when downloading and preparing to install, today's update brings the build number to 14393.105. This brings the build number on par with the Windows 10 for PCs build in the Production ring.