RPM did just what it was supposed to: It gave the files the attributes specified by the %attr macros.

16.3.2. Betcha Thought We Forgot

At the start of this section, we mentioned that the %attr macro wouldn't accept numeric UIDs or GIDs, and we promised to explain why. The reason is simply that, even if a package requires a certain user or group to own the package's files, the user may not have the same UID/GID from system to system. Wasn't that simple?