Odd occurences depending on how I power the arduino nano

Hi all, as per the title depending on how I power the nano the LEDs behave differently. In the video (imgur link below) when they're working in the first section the nano is plugged into my computer (either by the pins or through the usb header both work) in the second section when they flash white with some colour the nano is plugged into a mains usb adapter (5v 1A but the same happens with a power bank or 5v 4A usb adapter). I'm absoultely stumped so any help would be much appreciated. FastLED 3.5.0 (same thing happens with 3.3.2). Cheers

Solved - Thanks to Reddit, forgot to add a shared ground connection

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