Production plan it automatically duplicates on submit

My work flow is
Quotation (yearly) -> salesorder (monthly qty) -> production plan (get sales order) -> material request and workorders

I create new production plan, get sales order then fill rest of the information and submit. When I go to list view I see 2 production plans with same information but naming code is different and one is in 'draft’

(See the first two that have ‘now’ in date modified)

How can I fix this issue?