I explain my problem.
I had a shop in oscommerce I migrated to magento. (Category + Products(+pictures) + Customers)
Everything works fine, but at some point the groups most responsible products disappear from the shop and the database.
This is 3 times that I redo everything and I still have the same bug!
Have you already this bug and especially how to fix it or I could not continue under magento
Thank you to everyone =)