The path for your CC files should really be controlled by your project file (under FOLDER OPTIONS).
Hi and welcome to the forum!
This is definitely strange behavior, and not what I would expect. But, it's not necessarily a bad thing becuase this way, it will be looking in the same path for content center files, no matter which user is logged in.
I have found that the default behavior (%USERPROFILE% in the default path) is undesirable. Common library parts (including content center parts) should be used by everyone, so having them in different folders depending on the user profile can just cause user confusion and file resolution problems (for example, if User B opens an assembly created by User A).
Our organization uses Vault, so it's especially important that our content center maps to a common folder. But even before we had vault, I made a point of going to each user workstation and setting their default CC path to match all other users.
As Mike mentioned, you can control this in the project file. But that only works if your users never create new projects, or they know to set the CC path for each project they create. I find it's better (although not necessarily easier) to set the default in application options for each installation.
Cameron Whetten
Inventor 2014