openxlsx export incomplete xlsx file

I noted that when I try to save an object as xlsx using openxlsx, It fails to export all the data.
Some columns are incomplete. When I export to csv, I clearly see the omitted obs.
I am exporting 35 columns and 6800 rows, using an xlsx in order to import the formats and structure.
When I open the xlsx file, I received a warning stating that some columns can't be displayed or something related. However, the last time I export 5800 rows data frame, It worked flawless.
What can It be?

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