1st off, You need to change your name. For some reason I didn't see your name the first time but this forum, as per the rules at the top of the forum, does not allow the use of aliases. This thread will probably be locked if you reply again without changing your name.
Now that the housekeeping is out of the way you need to tell us exactly what your signal flow is.
Example XXX camera and XXX computer going through XXX cable to XXX switcher/mixer/scaler to XXX extender over XXX cable to XXX devices.
After we understand exactly what you are doing we can probably help.
Edit: A clean feed is an option on a proper video switcher, the fact that you don't know what it is probably indicates you don't have it, but we will reserve that judgement until we hear back from you.
Karl P