Opto endstops freezes repeiter host

Hey

I have a prusa, which I have modified whith a printrboard.
The original printer was delivered with a Gen 6 board I think, which uses 4 wired optoends.

Printrboard has only input for 3 wire
So I built an adapter using this circuit
my modifikation looks like this


Now to the problem

When I have zero endstops plugged in I have to press OK under the manual tab down in the debug section to unfreeze the program. Before I klick OK repeiter host shows 6 commands waiting. And after I press OK once I see the nozzle temperature moving up and down, I can move my step motors and I can start the heater.
Is this how the program should behave?

When I have all three Z,X,Y opto endstops plugged into the board, repeiter host remains frozen no matter how many times I hit OK.
I have tried every optoends one at a time, even two at a time works, but not three

Any ideas why this is not working?

My only thought is to much current drawn from the board.