There's likely nothing "wrong" (or "evil") about that message. It's just wireshark collecting packets together that it believes are related into a "complete" protocol unit. Unless you've set the MTU lower on an interface than you "should" (or you have an application running that is unexpectedly sending jumbo packets over a "conventional" link), it's most likely just TCP working as expected.
See, for example, https://osqa-ask.wireshark.org/questions/58186/tcp-segment-of-a-reassembled-pdu