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You PC is attempting to open a TCP connection to port 57748 on the printer and the printer won't accept it, hence the RST. As each attempt is rejected, the tcp stack on your PC then chooses the next available port for the subsequent attempt.
As you note eventually it does connect on port 80
As to why the printer rejects the connections on 57748, that's up to you to determine what process on your PC is attempting that connection and to then determine if that, or the printer are in error.
