I have 9300 (NEW) contacts to import from a CSV. I download import template from contacts then modify and save. i import csv from contacts module and map fields Account ID is to Account Name (Account ID) and Contact Owner ID is mapped to Contact Owner (User ID). i run import and all 9300 contacts are assigned to me. But if i just select 10 and create a new csv file and run import the contacts get assigned correctly. I repeated this several times and I cannot get all 9300 contacts assigned correctly.

Any advice? thanks in advance.