OK, the only thing I can think of is that the E- on the HX711 board isn't good. If you wire just one load cell's white/black to E+/E-, E+ should be 5V and E- should be zero, with the red wire at 5V*1000/(1000+1000)= 2.5V If E- comes up to 5V, it is a bad E- on the HX711.
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