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Ok, I see it now.
On your 8 bit adder you have splitters touching inputs of 4 bit adders. You’ll need to move them apart and connected all the outputs of splitters to inputs...

Thank you very much! I will make sure to fix the errors I had and I will come back if anything arises.

EDIT: Another ...

Thank you for the quick reply. The project is attached bellow. Please note that the main circuit has been modified since I was doing some testing.

8 bit CPU.CircuitProject

EDIT: Also, I have an off-topic question. Is it possible to take a number of 1 bit signals, pass them through a splitter ...

Hello! I have the following problem with LogicCircuit:
Whenever I power up my circuit, everything seems to be working fine except for the input buttons. Any idea why that might be happening? Please note that the Mode button works perfectly fine. Bellow you can find a picture of my setup. If any ...