Why did the shift register turn into a presence sensor?

Question

Android

Good afternoon. I decided to make several boards with LEDs to be able to connect them in cascade. In order not to waste pins, I used a TI SN74HC595N shift register.
I checked the operation of the circuit and firmware of the control controller on the prototyping board, then tried to solder it. It took a long time to fiddle, but visually I like the result.
That's just bad luck: when turned on, either all at once, or none of the LEDs are on. I thought - the contact went away, just raised my finger and a miracle happened: the circuit worked as it should, blinking the diodes in turn.
He removed his finger - everything went out again. I brought it up - it worked, and I don’t touch the circuit, but somewhere in 1 cm from it (it is the register that reacts to my presence).
I soldered it twice, each time more carefully, but each time the same result, while on the prototyping board it works as it should.
There are three assumptions: while soldering the wires, I burned the register, the wires go too close and create an inductance that breaks my finger and the third is grounding problems.

What happened. not to look nervous

Answer 1

this inside the run method points to a Runnable object

Answer 2

make pull-ups of the inputs of the register by 10 kilo-ohms per mass, shove the power capacitor - electrolyte and ceramics.