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SDL Trados 2017 Export to .xlf causing errors when imported

I have a client that sent me an .xlf file to translate from English to Simplified Chinese.  Importing it and translating it went fine.  When I export it back to .xlf they aren't able to import it and have the columns in the correct order.  I know I am missing something in the export but I can't figure out where.

Thanks,

Mei