[Bro] meaning of those message in weird.log

[bz Os]

Hello evry body,
I am doing a test in the detection of attack by bro sometime i have those
message in the weird.log i want to know what the mean and what can be the
cause of those message.
pleaz i want know what mean those n
dns_unmatched_msg
bad_TCP_checksum
truncated_tcp_payload
*TCP_ack_underflow_or_misorder*
inappropriate_FIN
dns_unmatched_reply
above_hole_data_without_any_acks
window_recision


Thanks
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