Its an asymmetrical waveform, which has been limited, clipped or highly compressed on the positive-going side of the waveform more-so than the negative-going side.
Might be due to insufficient mic powering or overload occurring somewhere in the signal chain.
If it sounds okay you probably don't need to worry about it, but if there is significant DC offset you might want to correct it. DC offset eats up headroom in your output file compared to a file without DC-offset, which isn't really a problem unless you are normalizing or attempting to maximize the loudness of your finished output. If DC offset is significant enough it can stress the amplifier and voice-coil of the speakers because current will be flowing to hold the cone still in that offset center position even when the speaker is supposed to be at rest and not moving in either direction due to the music input signal.