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UCD3138FW-HSFB: UCD3138-based full-bridge hard-switching power supply transformer primary winding waveform - "high and low shoulder" What is going on?

Part Number: UCD3138FW-HSFB
Other Parts Discussed in Thread: UCD3138

Based on UCD3138, a full-bridge hard-switching power supply was used to test the waveform of the primary winding of the transformer.

Some of them are normal, and some of them appear as the following figure: "High and low shoulders".

What is going on?