Thank you for using our online answers forum! That's a great question! Most likely, what is causing the issue is the HDMI to component Converter you are using. The Slingbox, a lot of times will not work at all with converters like this. I would recommend using only component. If that is not possible, I would try a different converter. They can work, however it us not supported.
Hope this Helps
The Sling Moderation Team