It is Normal. You do this when you find a frequency very effective, and you want to hit it very hard, then you use the wobble button to make the frequency to hit either side and wobble around the current frequency. And by design, the program would stop progressing, and the button would also change to red. But if you want to have the wobble feature applied to all the frequencies in the sequence, there is a wobble option in the settings tab, you can make the settings there.
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