For brushless dc motor drive, using three six state control mode, driven by IR2103 NMOS tube, driving signal is as follows (yellow for tube on the input, purple for the next pipe input) :

After IR2103, the output voltage waveform is as follows (yellow for tube on the input, purple for the next pipe input) :

Why tube on IR2103 output control signal would be such a waveform, should not only in the middle of the passage? For bosses have know what's going on