My contacts don't appear to be syncing properly in a number of ways:

1. I've linked my LinkedIn account to my Outlook.com account. There are some LinkedIn contacts that don't synchronize with Outlook.com (most do sync). Why would certain contacts not sync?
2. When syncing with Windows 8.1 Pro, there are some contacts that don't sync with the People app. The same contacts sync just fine with my Windows Phone and other devices (Android, iPhone, etc). Am I doing something wrong?

Thanks in advance.