Hash Display Troubles

I installed three consoles with the hash display cartridge to see the contents of the three arc furnaces in the chamber. Not necessary, but why not. There are three slot readers in the chamber to read each furnace slot 0 OccupantHash. The slot readers show a hash number but only on console no. 3 (right) I can select the three slot readers. Only here the IC housing is selectable too. On console 1+2 the slot readers are grey. Nothing else is selected in them. No filter applied. I quadruple checked the cables. The consoles are right next to each other on the same cable. What am I doing wrong?

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