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Headers not recognized as such in Multiterm Convert

Hello, I've been trying to convert my Excel file using Multitem Convert, but the software only recognizes two headers (Deutsch 1 and Deutsch 2), while I have many more (Deutsch 3, Français 1, Français 2...). In my Excel file, I've selected "header" for all the right cells of the header. So I don't understand...
I do have empty cells in my table, but I guess that's normal.
Could you please help me? Thanks!