HELP - Trying to make a beam from WS2812 neopixel

Hey peeps
Im new here, eheh, glad to make part of this big community
I'm trying to make a beam from a ws2812 neopixel, so i bought a len that works like a magnifying glass to absorve all the light form the LED and turn it into a beam.
I found a problem, so I need your help. WS2812 neopixel is made of 3 seperated led ( one red, one green, one blue), so when i have just one of them on I get just one beam. No problem so far. But when I turn on two or all at the same time i get 2 or 3 separated beams, and its not what I want.
I will leave pictures for better understanding





Any suggestions?

TY for your time

Miguel