There is no problem as such.
Untarring as root gives read, write & execute permission across the board whereas, when you untar as a regular user, as the owner of the file(s) you automatically have read, write and execute permission but for people in your group
or in the group others
they only have read and execute permissions. You as the owner of said files would need to assign write permissions for them.
The real problem is one of security. This is one of the reasons why you should always untar your archives as a regular user and only do the final installation procedure as root.
I hope my explaination makes sense