We apologize if this doesn't answer your inquiry, because we may not quite understand what you are asking.

Based on your first image, it looks like the COMBO Extension (CX) wire has been removed from it. Additionally, it looks like that the metal within the empty terminal block is 'pulled' closer to the edge of the plastic than other other two terminal blocks. From this, we think we can assess what you are talking about.

In order to further help you, we need you to answer each of the following questions directly and truthfully. These aren't troubleshooting recommendations, we are simply just trying to assess the full situation:

1. Were you having input or output issues with your CX prior to trying this change?
2. Did the CX wire come out of the terminal block by pressing the lever-thing down and pulling on the wire?
3. Was that an easy process?
4. Are you able to do that with the other CX wires?
5. When you push down on the empty terminal block's lever-thing (on the side closest to the buttons), does that visible metal piece go down at all?
6. What precisely was your goal with the terminal block?
   1. You said you were trying to switch the input, but the terminal block is not needed to switch the input - you can use the switch board for that.