td-agent from my source server is sending logs from beginning (1st line of the log)

[AlgeeRo]

good day, i got puzzle why my td-agent from my source server is sending logs (to kibana) from start or beginning (1st line of the log) every time if detects new line on the logs, as i know, td-agent should only send the newest entry in the logs going to kibana.

in this testing index (00001), when the count 27 came in / write, this also write count 25 and 26.
then when count 28 came in, this also write count 25,26 and 27.