The PlayHQ match import is a new addition and is bound to have a few rough edges. Post up any issues and they will be addressed quickly.
Be sure to let us know the PlayHQ match ID that you are having problems with.
Please ensure you post one thread per issue so that it is easier for them to be tracked.
Limitation - the import only works for completed matches. If the match is still "In Progress" then the import will not detect the player scores. You need to wait for the match to be completed to be able to import.