Windows app decided my imported passwords were notes

I also need a solution for this for a slightly different issue. I think the problem for both of us is that we did not correctly name the columns before the import. What should have been the Password column got labeled as the Note column.
In my case I did another import and correctly labeled each column, but now I have two items for each remembered password, one for the original, incorrect import, and one for the new, correct import.
I need to be able to either delete all of the incorrect entries in bulk or delete everything and start over.