Please, before doing any of the things I will list below, do a NEW
export of yor database to keep as a safeguard. It is *very* important
that you keep a good backup of your database, in case any of the steps
The issue, is that you have exported the database but probably not with
the initial table drop option ( so, you are trying to add the records to
the exiting ones, creating duplicate records.
If you script has the SQL to create the tables, then just deleted your
database, and then use your new script to recreate it.
If you script has JUST the sql for the data, ( no table structure),
then, you need to keep the tables, but clear them of all the stored data.
If unsure of what you are doing, may I suggest you seek a developer to
assist you in that, since you wouldn't want to risk losing any of