That might indicate a change in voltage..
Increase the vertical resolution of your scope until the wave fills as much of the screen as you can manage. Take a set of readings with the scope powered away from the 12v-230v adapter, then take a set with it connected to the adapter. See if one set of waveforms is shorter than the other.
Partly wrong position&color on Neopixel strip LEDs
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Please be positive and constructive with your questions and comments.