Log that has wildly different times, but Splunk thinks it is a single event

It recognizes the datetime correctly based on the first line, but it seems to randomly be grouping up lines. Example log that has wildly different times, but Splunk thinks is a single event [INFO][DesDycrptor][20170911-19:55:46.798] Decrypting file: equity_option_open_uf.dif.gz.enc.20170911 [INFO][DesDycrptor][20170911-19:55:46.800] Unzipping file: equity_option_open_uf.dif.gz [INFO][S3Client][20170911-19:55:46.803] Copying file: /tmp/###############-7351797381042467611/equity_option_open_uf.dif to s3 bucket: ###################### key: ##########/#######/2017/09/11/equity_option_open_uf.dif.20170911.