Lights not showing what they are supposed to

Hi,
I have a RPI model 3b connected to this [WS2812B](https://www.amazon.es/dp/B07Q9KCC6M?psc=1&ref=ppx_yo2ov_dt_b_product_details). I have run many different tests, and none of them produce the expected results. They leds appear to light randomly, and differently every time I ran the same script. It sems they have a very strange behaviour. Any ideas on what can be happening ? any help appreciated.

thanks

Start by reproducing the reported behavior on a Raspberry Pi 3B with the linked WS2812B LEDs and the user's script, though no script or project file is provided. Check the hardware and driver assumptions before narrowing down the cause; done means identifying a reproducible diagnosis or fix for the inconsistent LED output.

Written by the indexing model from the issue text.