why the ethernet and ip header of packets, which are captured by libpcap function, are distorted

[wen lui <esolvepolito () gmail com>]

I used libpcap function pcap_next() to capture some tcp packets I checked
the bytes of the captured packets and notice that the ethernet and ip
header of packets are distorted, in a mess with a lot 0's but the TCP
header is fine

what are potential reasons for this?
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