Hi,

In my salesforce org when i convert a lead it creates multiple account,contacts and opportunities at the same time and when i see the created by timings and created by user both are same.

http://docs.releasenotes.salesforce.com/en-us/spring16/release-notes/rn_sales_leads_edit_converted_leads.htm

In above link there is an article i studied about permission set which will enalble us to create multiple account,contacts and opportunities and we can able to view lead again in salesforce detail page but i disabled this options.

Even though i disabled this option i have duplicates created in my salesforce org and i have lead which i can edit on detail page after it converted...I didn't have any trigger.

Please help !!!!!!!!

Thanks,
Raj