Got the Tweet history .csv file, saw that tweet ids are inaccurate. the last 4 digits tens to be zeros, as if the tweet id rounds up or something. Thanks

This sounds very much like a data mangling issue. Are you using Javascript to parse the CSV file? You should always ensure that you use the id_str value to avoid this. Read more about Twitter Snowflake IDs and why they pose a problem for Javascript and languages unable to handle very large integers.