APA102 + Pico (problem on write data)

@Spocki yes I do use a external power supply (5V 1A)
I used a similar setting as shown on these picture:

1. 5V connected to 5V power supply
   
2. GND connected to 5V power supply + Pico GND (without connection GND also to Pico, everything is random and not stable)
   
3. Data connected to Pico MOSI
   
4. Clock connected to Pico SCK