DSO Waveform overlapping
You have a non-simple signal waveform that has an overall "repeating" time-span in excess of the timebase setting of your DSO. This means that you will "see" (apparently simultaneously) multiple instances of parts of your waveform on your screen. Due to persistance of the eye it looks like one waveform but I can assure you that you are seeing multiple parts of the "full" waveform sitting on top of each other.

For instance, in the middle of your display, you see the same effect but it's just two partial sections of your "full" waveform triggering at the same point in the screen (you can see the trigger arrow above the rising edge). I've copied your picture and edited the middle section (into two parts) to demonstrate what I mean: -