The LED control chip repeats the signál. There should be a resistor between long data wire and first LED. Also keep power wires short.
If there are long power wires, keep them far from the data wires.
The LED control chip repeats the signál. There should be a resistor between long data wire and first LED. Also keep power wires short.
If there are long power wires, keep them far from the data wires.