When you have multilingual field, that is displayed in grid and

• for some records in grid it doesn't have value;

• administrative console language match that column's language

Then you got primary language column value displayed instead of given language value. Example:

Language #1 - English (primary)
Language #2 - Russian
Multilingual field: Subject (l1_Subject - on english, l2_Subject - on russian)

Current language in administrative console is russian and column l2_Subject is empty in database, but you values from l1_Subject column.