Traces not complete

Hi Alex,
Thank you for your answer.
I added these two code lines:

self._scope.clock.adc_src = ‘clkgen_x1’
self._scope.adc.decimate = 40

By varying the adc.decimate to 20 the first dense spikes get longer, which totally makes sense.
I assumed now that the trace is a complete one. Should I ignore the other spikes?
Is it normal to have these spikes , why they appear in my trace?
Best,
Sou