Is this your main power meter or your device power meter (that only gets filled once Sense starts detecting your devices) ? If it is your device-level power meter, for a detected dryer, I would suggest the same as @samwooly1. If the picture is from your main power meter for the whole house, I would suggest you take a look at my dryer here in the community device library - same exact waveform after Sense detection.
Not sure what the extension is at the end, but tit is there. Perhaps the heating element stays warm for bit.