May we ask what are the names of the sellers please?
Did you go to Find Sellers and Click on Keywords to enter their names?
go to message (menu on the left side) and see the search icon (maginifier icon) klik it and type the name of the sellers there, you should find them
Just open your Orders screen, open the order you wish to repeat and click on seller's avatar.
It will open his profile.
Maybe they are not available here now.